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Factory Stereo Upgrades for your 2008 RS4

Go beyond factory limitations, eliminate "baked-in" equalization, and add the power your system’s been missing when you shop for specialized OEM integration tools at Sonic Electronix.

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Crux VIMMB-85P

Video In-Motion Activation for select 2017 AMG E-Class with Comand NTG5.5 Navigation Radio

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Video In-Motion Activation for select 2017 AMG E-Class with Comand NTG5.5 Navigation Radio

• VIM (Video In-Motion) Activation
• For select 2017 AMG E-Class
• For vehicles with Comand NTG5.5 navigation radio
• Plug and play activation via the OBD II port
• No dealer programming required
• Easy and time-saving 30 second coding procedure

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No Fit Icon Doesn't fit your RS4

List price $462.00
-36% $297.00

In stock.

• VIM (Video In-Motion) Activation
• For select 2017 AMG E-Class
• For vehicles with Comand NTG5.5 navigation radio
• Plug and play activation via the OBD II port
• No dealer programming required
• Easy and time-saving 30 second coding procedure

NAV-TV UCT-PRG (NTV-KIT511)

Interface to Connect a Back Up Camera to Select 2014-Up Chrysler and Jeep Vehicles with 8.4" U-CONNECT Screen

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Interface to Connect a Back Up Camera to Select 2014-Up Chrysler and Jeep Vehicles with 8.4" U-CONNECT Screen

• Rear View Camera Interface
• For Select 2014-Up Chrysler and Jeep Vehicles
• Works with the 8.4" U-CONNECT Screen
• Plug-n-Play Interface

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List price $599.00
-8% $549.00

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• Rear View Camera Interface
• For Select 2014-Up Chrysler and Jeep Vehicles
• Works with the 8.4" U-CONNECT Screen
• Plug-n-Play Interface

PAC LPA-E.4

4-Channel 400W RMS LOCPRO Advanced Line Out Converter with Bass Remote

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4-Channel 400W RMS LOCPRO Advanced Line Out Converter with Bass Remote

• 4-channel active line out converter
• Speaker Level handles up to 400W RMS
• Selectable turn-on mode
• 9.5Vrms output
• 12-volt turn-on lead output

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1
List price $209.00
-24% $159.00

In stock

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• 4-channel active line out converter
• Speaker Level handles up to 400W RMS
• Selectable turn-on mode
• 9.5Vrms output
• 12-volt turn-on lead output

GROM Audio VAUX (C-VAUX)

AV Cable for VLine VL2 Aftermarket Backup and Front Camera Integration

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AV Cable for VLine VL2 Aftermarket Backup and Front Camera Integration

• AV Cable for Aftermarket Backup and Front View Camera Integration
• Compatible with VLine VL2 Navigation, Infotainment and CarPlay/Android Auto integration system
• Adds a 3.5mm aux connection from your VLine VL2 unit

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$13.99

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• AV Cable for Aftermarket Backup and Front View Camera Integration
• Compatible with VLine VL2 Navigation, Infotainment and CarPlay/Android Auto integration system
• Adds a 3.5mm aux connection from your VLine VL2 unit

Axxess AXDSPX-A2B3

Install a DSP and New Amplifier to Factory System in select 2018-2025 vehicles from Lincoln with Revel A2B Amplifier

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Install a DSP and New Amplifier to Factory System in select 2018-2025 vehicles from Lincoln with Revel A2B Amplifier

• Plug and Play T-harness for faster installation
• For select 2018-2025 vehicles from Lincoln with Revel A2B amplifier
• Selectable 31-band graphic EQ or 5-band parametric EQ
• Can be used with OE and aftermarket radios
• Compatible with both Android and Apple devices
• Settings adjusted via Bluetooth in a smart device

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List price $611.99
-10% $549.99

In stock.

• Plug and Play T-harness for faster installation
• For select 2018-2025 vehicles from Lincoln with Revel A2B amplifier
• Selectable 31-band graphic EQ or 5-band parametric EQ
• Can be used with OE and aftermarket radios
• Compatible with both Android and Apple devices
• Settings adjusted via Bluetooth in a smart device

GROM Audio MAZU3

USB, Bluetooth, and AUX Integration Adapter Kit for select 2002-2008 vehicles from Mazda

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USB, Bluetooth, and AUX Integration Adapter Kit for select 2002-2008 vehicles from Mazda

• USB Integration Adapter Kit for select 2002-2008 vehicles from Mazda
• Play music stored on USB stick, or via USB from iPhone
• Plug and play installation
• Control media from stereo or steering wheel
• Track information and text on select stereos

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$174.99

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• USB Integration Adapter Kit for select 2002-2008 vehicles from Mazda
• Play music stored on USB stick, or via USB from iPhone
• Plug and play installation
• Control media from stereo or steering wheel
• Track information and text on select stereos

GROM Audio LEX3LVL2

Factory Radio Android Auto, Apple CarPlay and Navigation Integration Upgrade for select 2000-2006 vehicles from Lexus, Toyota

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Factory Radio Android Auto, Apple CarPlay and Navigation Integration Upgrade for select 2000-2006 vehicles from Lexus, Toyota

• Factory Radio Integration for VLine Infotainment Systems
• Compatible with select 2000-2006 vehicles from Lexus, Toyota
• VLine infotainment system in silver metal enclosure
• Android Auto and Apple CarPlay upgrade via USB or wireless
• Power harnesses, GPS receiver, microphone and USB cable included

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No Fit Icon Doesn't fit your RS4

List price $747.99
-9% $679.95

Available

Ships in 10-14 days

• Factory Radio Integration for VLine Infotainment Systems
• Compatible with select 2000-2006 vehicles from Lexus, Toyota
• VLine infotainment system in silver metal enclosure
• Android Auto and Apple CarPlay upgrade via USB or wireless
• Power harnesses, GPS receiver, microphone and USB cable included

PAC LPHGM52

Vehicle Specific Audio Integration T-Harness for select 2016-2024 vehicles from Chevrolet, GMC

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Vehicle Specific Audio Integration T-Harness for select 2016-2024 vehicles from Chevrolet, GMC

• Amplifier, LOC, or sound processor integration T-harness for select 2016-2024 vehicles from Chevrolet, GMC
• Provides necessary high-level inputs and speaker outputs
• Compatible in non-amplified vehicles
• Only compatible in vehicles with "IOA" or "IOB" RPO code
• Works with PAC LocPro Advanced LOCs
• Works with amps and sound processors with speaker-level inputs

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No Fit Icon Doesn't fit your RS4

List price $109.00
-42% $63.00

Available

Ships in 10-14 days

• Amplifier, LOC, or sound processor integration T-harness for select 2016-2024 vehicles from Chevrolet, GMC
• Provides necessary high-level inputs and speaker outputs
• Compatible in non-amplified vehicles
• Only compatible in vehicles with "IOA" or "IOB" RPO code
• Works with PAC LocPro Advanced LOCs
• Works with amps and sound processors with speaker-level inputs

iDataLink Maestro HRN-AR-FO3 Wiring Harness

Install New Amplifier and Connect Maestro AR Module in select 2015-2025 Mustang

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Install New Amplifier and Connect Maestro AR Module in select 2015-2025 Mustang

• Amplifier replacement harness for select 2015-2025 Mustang
• Compatible with Ford vehicles with 8" "My Ford Touch" stereo and Sony amplifier
• Includes all necessary wiring to install Maestro AR module
• Plug-n-play, easy installation

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1
List price $43.99
-20% $34.99

Available

Ships in 10-14 days

• Amplifier replacement harness for select 2015-2025 Mustang
• Compatible with Ford vehicles with 8" "My Ford Touch" stereo and Sony amplifier
• Includes all necessary wiring to install Maestro AR module
• Plug-n-play, easy installation

Axxess AXDSPL-MI1

Install a DSP and New Amplifier to Factory System in select 1992-2012 vehicles from Mitsubishi

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Install a DSP and New Amplifier to Factory System in select 1992-2012 vehicles from Mitsubishi

• Plug and Play T-harness for faster installation
• For select 1992-2012 vehicles from Mitsubishi
• Designed for non-amplified systems
• Can be used with factory and aftermarket radios
• Selectable 31-band graphic EQ or 5-band parametric EQ
• Settings adjusted via Bluetooth in a smart device
• Selectable high pass, low pass, or bandpass filters

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List price $431.00
-30% $299.99

In stock.

• Plug and Play T-harness for faster installation
• For select 1992-2012 vehicles from Mitsubishi
• Designed for non-amplified systems
• Can be used with factory and aftermarket radios
• Selectable 31-band graphic EQ or 5-band parametric EQ
• Settings adjusted via Bluetooth in a smart device
• Selectable high pass, low pass, or bandpass filters

Crux VIMGM-94

Video In-Motion Activation for select 2006-2017 vehicles from GMC, Chevrolet, Cadillac

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Video In-Motion Activation for select 2006-2017 vehicles from GMC, Chevrolet, Cadillac

• VIM (Video In-Motion) Activation
• For select 2006-2017 vehicles from GMC, Chevrolet, Cadillac
• Retains factory installed navigation system for passenger access
• Onscreen access to Factory Bluetooth Keypad
• Navigation Destination Address Entry
• Plug and play installation

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1
List price $331.80
-36% $213.30

In stock

Only 3 Left!

• VIM (Video In-Motion) Activation
• For select 2006-2017 vehicles from GMC, Chevrolet, Cadillac
• Retains factory installed navigation system for passenger access
• Onscreen access to Factory Bluetooth Keypad
• Navigation Destination Address Entry
• Plug and play installation

Axxess AXSUB-GM3

Active 2-Channel Line Output Converter and Subwoofer Data Interface for select 2019-2023 vehicles from Chevrolet, GMC

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Active 2-Channel Line Output Converter and Subwoofer Data Interface for select 2019-2023 vehicles from Chevrolet, GMC

• Line Output Converter and Subwoofer Data Interface
• Integrates with amplified or non-amplified factory OEM systems
• Allows for the addition of an aftermarket subwoofer
• Compatible with select 2019-2023 vehicles from Chevrolet, GMC

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List price $228.99
-10% $205.99

In stock

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• Line Output Converter and Subwoofer Data Interface
• Integrates with amplified or non-amplified factory OEM systems
• Allows for the addition of an aftermarket subwoofer
• Compatible with select 2019-2023 vehicles from Chevrolet, GMC

Axxess AXSUB-GM4

Active 2-Channel Line Output Converter and Subwoofer Data Interface for select 2019-2023 vehicles from Chevrolet, GMC

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Active 2-Channel Line Output Converter and Subwoofer Data Interface for select 2019-2023 vehicles from Chevrolet, GMC

• Line Output Converter and Subwoofer Data Interface
• Integrates with amplified or non-amplified factory OEM systems
• Allows for the addition of an aftermarket subwoofer
• Compatible with select 2019-2023 vehicles from Chevrolet, GMC

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List price $228.99
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In stock.

• Line Output Converter and Subwoofer Data Interface
• Integrates with amplified or non-amplified factory OEM systems
• Allows for the addition of an aftermarket subwoofer
• Compatible with select 2019-2023 vehicles from Chevrolet, GMC

GROM Audio LEXKLVL2

Factory Radio Android Auto, Apple CarPlay and Navigation Integration Upgrade for select 2015 RX450h and RX350

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Factory Radio Android Auto, Apple CarPlay and Navigation Integration Upgrade for select 2015 RX450h and RX350

• Factory Radio Integration for VLine Infotainment Systems
• Compatible with select 2015 RX450h and RX350
• VLine infotainment system in silver metal enclosure
• Android Auto and Apple CarPlay upgrade via USB or wireless
• Power harnesses, GPS receiver, microphone and USB cable included

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No Fit Icon Doesn't fit your RS4

$679.95

In stock.

• Factory Radio Integration for VLine Infotainment Systems
• Compatible with select 2015 RX450h and RX350
• VLine infotainment system in silver metal enclosure
• Android Auto and Apple CarPlay upgrade via USB or wireless
• Power harnesses, GPS receiver, microphone and USB cable included

Crux ACPMB-50W

Wireless Apple CarPlay and Android Auto Smart-Play Integration System with Multi Camera Input for select 2014-2025 vehicles from Mercedes-Benz with NTG5/5.1 System

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Wireless Apple CarPlay and Android Auto Smart-Play Integration System with Multi Camera Input for select 2014-2025 vehicles from Mercedes-Benz with NTG5/5.1 System

• Smart-Play integration system with multi camera input
• For select 2014-2025 vehicles from Mercedes-Benz with NTG5 system
• Integrates Wired/Wireless Android Auto and CarPlay
• Adds front and rear aftermarket camera inputs
• Retains functionality of the OEM backup camera if present
• Includes a USB-3.5MM auxiliary audio adapter

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List price $1199.95
-46% $650.99

In stock.

• Smart-Play integration system with multi camera input
• For select 2014-2025 vehicles from Mercedes-Benz with NTG5 system
• Integrates Wired/Wireless Android Auto and CarPlay
• Adds front and rear aftermarket camera inputs
• Retains functionality of the OEM backup camera if present
• Includes a USB-3.5MM auxiliary audio adapter

GROM Audio AUDO4 (GROM-MST4-AUDO)

Android and iOS Smartphone Integration for Select 2004-2009 Audi Fiber Optic Radios

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Android and iOS Smartphone Integration for Select 2004-2009 Audi Fiber Optic Radios

• Android, Bluetooth, iPhone Integration Kit
• Compatible With Select 2004-2009 Audi Fiber Optic Radios
• USB, AUX, Bluetooth, Android, iPod Car Integration
• Android in-car play, charge and control
• Plugs Directly Into Vehicles Harness
• Two EXT ports for AUX-IN, Bluetooth and iPod
• Streaming Audio for Android 4.1 and Above

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• Android, Bluetooth, iPhone Integration Kit
• Compatible With Select 2004-2009 Audi Fiber Optic Radios
• USB, AUX, Bluetooth, Android, iPod Car Integration
• Android in-car play, charge and control
• Plugs Directly Into Vehicles Harness
• Two EXT ports for AUX-IN, Bluetooth and iPod
• Streaming Audio for Android 4.1 and Above

Diamond Audio BTDSP66LCD

6-Channel Digital Signal Processor with LCD Display

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6-Channel Digital Signal Processor with LCD Display

• 6-Channel Digital Signal Processor with LCD Display
• Includes six inputs and six outputs
• 15-band parametric equalizer
• External Bluetooth dongle included

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$379.99

In stock.

• 6-Channel Digital Signal Processor with LCD Display
• Includes six inputs and six outputs
• 15-band parametric equalizer
• External Bluetooth dongle included

Crux VIMVW-92

Video In-Motion Activation for select 2005-2013 vehicles from Volkswagen, Bentley with MFD3 and RNS-510 Navigation Systems

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Video In-Motion Activation for select 2005-2013 vehicles from Volkswagen, Bentley with MFD3 and RNS-510 Navigation Systems

• VIM (Video In-Motion) Activation
• For select 2005-2013 vehicles from Volkswagen, Bentley
• For vehicles with MFD3 and RNS-510 navigation systems
• Retains factory-installed navigation system for passenger access
• Onscreen access to Factory Bluetooth Keypad
• Navigation Destination Address Entry
• Activation of video signal from aftermarket front or rear-view camera
• Plug and play installation

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List price $331.80
-36% $213.30

In stock.

• VIM (Video In-Motion) Activation
• For select 2005-2013 vehicles from Volkswagen, Bentley
• For vehicles with MFD3 and RNS-510 navigation systems
• Retains factory-installed navigation system for passenger access
• Onscreen access to Factory Bluetooth Keypad
• Navigation Destination Address Entry
• Activation of video signal from aftermarket front or rear-view camera
• Plug and play installation

Metra AXAMP-GM33

Amplifier Integration Interface for

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Amplifier Integration Interface for

• Amplifier Integration Interface for
• Provides 6 channels of 5-volt preamp output
• For use with an aftermarket amplifier
• Designed for non-amplified systems

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• Amplifier Integration Interface for
• Provides 6 channels of 5-volt preamp output
• For use with an aftermarket amplifier
• Designed for non-amplified systems

Crux VIMCF-93C

Video In-Motion Activation for select 2013-2017 vehicles from Ram, Dodge, Jeep with 8.4" Uconnect Systems

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Video In-Motion Activation for select 2013-2017 vehicles from Ram, Dodge, Jeep with 8.4" Uconnect Systems

• VIM (Video In-Motion) Activation
• For select 2013-2017 vehicles from Ram, Dodge, Jeep
• For vehicles with 8.4" Factory-installed Uconnect System
• Retains factory installed navigation system for passenger access
• Onscreen access to Factory Bluetooth Keypad
• Navigation Destination Address Entry
• Plug and play installation

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List price $317.10
-36% $203.85

In stock.

• VIM (Video In-Motion) Activation
• For select 2013-2017 vehicles from Ram, Dodge, Jeep
• For vehicles with 8.4" Factory-installed Uconnect System
• Retains factory installed navigation system for passenger access
• Onscreen access to Factory Bluetooth Keypad
• Navigation Destination Address Entry
• Plug and play installation

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    FAQ Frequently asked questions in Factory Stereo Upgrades


    Yes, you can upgrade your car's factory stereo without voiding the warranty, as long as the installation is done correctly and with compatible aftermarket accessories. Many car manufacturers understand that customers may want to personalize their audio systems, and they allow aftermarket upgrades that do not interfere with the vehicle's essential functions. To avoid any warranty issues, it is essential to choose reputable upgrade accessories from trusted brands. Additionally, consider using professional installation services or following the manufacturer's recommended guidelines when installing the upgrade components. By taking these precautions, you can enjoy an improved audio experience without affecting your car's warranty coverage.
    Yes, upgrading your factory stereo with high-quality accessories can significantly improve sound quality. Factory stereos are often designed to meet cost considerations, resulting in average audio performance. Aftermarket accessories, on the other hand, are built with audio excellence in mind, offering better sound clarity, increased power output, and improved bass response. Upgrading speakers and adding amplifiers can enhance audio reproduction and provide a richer, more balanced sound. Additionally, advanced head units with features like equalizers, sound processors, and digital signal processing can fine-tune the audio output to match your preferences and optimize the sound for your vehicle's interior acoustics. Overall, a well-planned factory stereo upgrade can transform your car's audio system into a premium audio experience.
    Factory stereo upgrade accessories are available for a wide range of car models, but compatibility can vary depending on the vehicle's make and year. It is essential to check the specifications and compatibility of each accessory with your car's make and model before making a purchase. Many reputable manufacturers provide compatibility information on their websites or packaging, making it easier to select the right accessories for your car. Additionally, consider consulting with a car audio specialist or using online resources to find accessories that are confirmed to be compatible with your specific vehicle. By ensuring compatibility, you can enjoy a seamless installation and optimal performance from the upgrade accessories.
    The ability to install factory stereo upgrade accessories yourself depends on your experience and comfort level with car audio installations. Some upgrades, such as replacing speakers or installing a new head unit, may be relatively straightforward for individuals with basic automotive DIY skills. However, certain upgrades, like adding amplifiers or integrating advanced sound processors, can be more complex and may require technical expertise. If you are unsure about the installation process or want to ensure a professional and polished result, it is recommended to seek professional installation services. Professional installers have the necessary tools, knowledge, and experience to perform the upgrade correctly and efficiently, avoiding potential issues and ensuring optimal performance from the upgraded accessories.
    Yes, but it often requires a specialized interface. Premium systems (like Bose or Lexicon) usually use a factory amplifier that sends processed signals to the speakers. To add a sub, you typically need an LOC that can handle high-voltage input or a vehicle-specific T-harness that taps into the signal before it reaches the factory amp.
    High-quality interfaces from brands like PAC or iDatalink are designed to communicate with the vehicle's CAN-bus system. They provide a "Remote Turn-On" lead for your aftermarket amplifiers, ensuring they only power up when the vehicle is on or the radio is active, preventing parasitic battery drain.
    Some modern vehicles (particularly those from Chrysler, Dodge, Jeep, and RAM) perform a "load test" on the speaker outputs. If you disconnect the factory speakers to add an amplifier, the car may think the speakers are blown and mute the audio output entirely. A load-generating device mimics the electrical resistance of a speaker, "tricking" the factory system into operating normally.

    All About

    Factory Stereo Upgrades

    When you want to add subwoofers or high-end speakers to a factory system, you need more than just a standard wire splice. Our selection of factory stereo upgrade components ensures that your new gear communicates perfectly with your vehicle’s existing computer systems.

    Line Output Converters (LOCs)

    Line output converters (LOCs) take the high-level signal meant for your factory speakers and convert it into a low-level RCA signal that an aftermarket amplifier can use.
    We carry everything from basic two-channel converters to advanced units from brands like AudioControl, which feature "AccuBASS" to counteract the bass roll-off often programmed into factory stereos.

    Digital Signal Processors (DSP)

    Factory radios are often tuned to protect cheap paper speakers, resulting in a "flat" or muddy sound. A Digital signal processor (DSP) allows you to take complete control of your acoustic environment.

    By using a DSP, you can sum signals, eliminate factory EQ curves, and adjust time alignment so that the music reaches your ears perfectly, regardless of where the speakers are placed.

    Vehicle-Specific Interfaces & Harnesses

    Cutting into your factory wiring can void warranties and cause electrical headaches. We offer plug-and-play harnesses and interfaces from leaders like iDatalink Maestro and PAC.

    These modules allow you to add aftermarket amplifiers while retaining steering wheel controls, factory chimes, and even OnStar or SYNC features.

    Why Upgrade Your Factory System?

    By integrating high-quality aftermarket amplifiers and speakers into your existing setup, you gain:

    • Increased Headroom: Play music louder without distortion
    • Full Range Sound: Restore the deep low-end frequencies that factory systems often filter out to protect small speakers
    • OEM Aesthetics: Keep your interior looking exactly as the manufacturer intended while enjoying a "stealth" high-end audio system

    The Sonic Electronix Advantage

    Choosing the right integration part can be complex given the variety of vehicle trims and "premium" sound packages (like Bose, Sony, or Harman Kardon). At Sonic Electronix, we take the guesswork out of the process.

    Our Fit Finder is the industry standard for ensuring compatibility. When you shop with us, you aren't just buying a part; you're gaining access to our expert support team and our massive inventory of the latest car audio technology. We offer competitive pricing, fast shipping, and the technical knowledge required to help you build the system of your dreams.

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    We love people and we're ready to help you! See what separates us from our competition.

    Take advantage of our VIP rewards like 10% back on your purchases, free 2-day shipping, extended warranties, and free returns! Gain access to all of these rewards without any membership fees.
    Get great discounted (and possibly FREE) installation accessories with most car stereo purchases. This includes dash kits, wiring harnesses and antenna adapters that you will need to properly install your new car stereo.
    We are an Authorized Dealer for all the brands we sell, including the most premium brands in car and marine audio such as Hertz, JL Audio, NVX, Rockford Fosgate, Kicker, Alpine, Kenwood and many more.
    Shop Deals and get up to 30% off premium brands! Shop Now! We are always looking out for the best products and deals to offer our customers. Don’t pay too much by shopping elsewhere!
    We have information on brands, gear, and more for you to explore! Check out our YouTube Channel for helpful how-to videos, product reviews, and Q&As. For a more detailed look, also visit our Learning Center!
    Our trained experts are here to assist you! They are just a phone call or click away to help you get the right gear for you and your vehicle!
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    Modern vehicles often require specific brackets, wiring harnesses, and mounting solutions. A fit guide ensures:

    • You see only parts engineered for your exact vehicle
    • You avoid incompatible radios, speakers, or wiring
    • Installation is smoother, faster, and frustration-free
    • You get the correct accessories the first time

    Whether you're replacing a factory stereo or upgrading your entire audio system, the Fit Finder eliminates uncertainty.