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Car Stereo Installation & Accessories for your 2007 A3

Installing an aftermarket head unit involves more than just choosing a screen; it's about building a bridge between new technology and your vehicle's factory architecture. Without the right installation accessories, a high-end receiver can't provide the seamless look or the integrated functionality your car was designed with. From dash kits that match your interior texture to complex digital interfaces that talk to your vehicle's computer, these components are what make a professional-grade installation possible.

Whether you're looking to retain your steering wheel controls, adapt a proprietary antenna plug, or ensure your new Double-DIN screen sits flush in the dash, we carry a comprehensive selection of gear from industry leaders like Metra, Scosche, PAC, and iDatalink.

Use our FitFinder to find the exact parts required for your specific year, make, and model. It's the most reliable way to ensure your DIY project results in a factory-finished look.

It's a no-brainer. Get your installation gear here.

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Metra 86-9001

1998-2006 Volkswagen/Audi/Mercedes Radio Removal Tool

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1998-2006 Volkswagen/Audi/Mercedes Radio Removal Tool

• Radio removal tool for select 1998-2006 Volkswagen, Audi, and Mercedes vehicles

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List price $23.99
-13% $20.99

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• Radio removal tool for select 1998-2006 Volkswagen, Audi, and Mercedes vehicles

Metra 40-EU55

Antenna Adapter for select 2000-2026 vehicles from Audi, Chevrolet, Ram

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Antenna Adapter for select 2000-2026 vehicles from Audi, Chevrolet, Ram

• Antenna adapter
• For select 2000-2026 vehicles from Audi, Chevrolet, Ram
• Use for replacing vehicle radio
• Male Motorola connector and power wire on one end
• Male European-style FAKRA on the other end

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• Antenna adapter
• For select 2000-2026 vehicles from Audi, Chevrolet, Ram
• Use for replacing vehicle radio
• Male Motorola connector and power wire on one end
• Male European-style FAKRA on the other end

Metra 40-VW10 Antenna Adapter

Connect your factory antenna to a new aftermarket radio for select 1973-2025 vehicles from Audi, Mercedes-Benz, Volkswagen

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Connect your factory antenna to a new aftermarket radio for select 1973-2025 vehicles from Audi, Mercedes-Benz, Volkswagen

• Factory Antenna to Aftermarket Radio Adapter
• Compatible with select 1973-2025 vehicles from Audi, Mercedes-Benz, Volkswagen Vehicles
• Factory antenna with flat plug to aftermarket radio
• A capacitor is included to match the impedance

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• Factory Antenna to Aftermarket Radio Adapter
• Compatible with select 1973-2025 vehicles from Audi, Mercedes-Benz, Volkswagen Vehicles
• Factory antenna with flat plug to aftermarket radio
• A capacitor is included to match the impedance

PAC SAT-01 Antenna Adapter

Connect your factory SiriusXM antenna to a new aftermarket radio for select 2004-2024 vehicles from Ford, Audi, GMC

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Connect your factory SiriusXM antenna to a new aftermarket radio for select 2004-2024 vehicles from Ford, Audi, GMC

• Retains the Use of the OEM Satellite Antenna with an Aftermarket Satellite Radio Turner
• Plug and Play Installation
• Compatible with Vehicles using a FAKRA Style Antenna Connector

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• Retains the Use of the OEM Satellite Antenna with an Aftermarket Satellite Radio Turner
• Plug and Play Installation
• Compatible with Vehicles using a FAKRA Style Antenna Connector

Metra 40-VW53 Antenna Adapter

Connect your factory antenna to a new aftermarket radio for select 1973-2025 vehicles from Audi, Mercedes-Benz, Volkswagen

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Connect your factory antenna to a new aftermarket radio for select 1973-2025 vehicles from Audi, Mercedes-Benz, Volkswagen

• Aftermarket Radio To Factory Antenna Adapter (Amplified)
• Compatible with select 1973-2025 vehicles from Audi, Mercedes-Benz, Volkswagen Vehicles
• Includes Power Wire For Antenna Booster
• Can Be Used In Place Of 40-VW54

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List price $17.99
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• Aftermarket Radio To Factory Antenna Adapter (Amplified)
• Compatible with select 1973-2025 vehicles from Audi, Mercedes-Benz, Volkswagen Vehicles
• Includes Power Wire For Antenna Booster
• Can Be Used In Place Of 40-VW54

Metra 40-EU56 Antenna Adapter

Connect your factory antenna to a new aftermarket radio for select 2005-2025 vehicles from Audi, Mercedes-Benz, Volkswagen

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Connect your factory antenna to a new aftermarket radio for select 2005-2025 vehicles from Audi, Mercedes-Benz, Volkswagen

• Amplified Antenna Adapter
• For Use With Aftermarket Radios Installation
• Plug and Play

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• Amplified Antenna Adapter
• For Use With Aftermarket Radios Installation
• Plug and Play

Scosche VWA4B Antenna Adapter

Connect your factory antenna to a new aftermarket radio for select 2000-2026 vehicles from Audi, Chevrolet, Volkswagen

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Connect your factory antenna to a new aftermarket radio for select 2000-2026 vehicles from Audi, Chevrolet, Volkswagen

• Audi/BMW/VW Antenna Adaptor
• adapts factory antenna to aftermarket radio
• select 2000-2026 vehicles from Audi, Chevrolet, Volkswagen Vehicles

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List price $15.79
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• Audi/BMW/VW Antenna Adaptor
• adapts factory antenna to aftermarket radio
• select 2000-2026 vehicles from Audi, Chevrolet, Volkswagen Vehicles

American International AudK615

Single DIN Stereo Dash Kit for select 2006-2010 A3 and A3 Quattro with Symphony Stereo

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Single DIN Stereo Dash Kit for select 2006-2010 A3 and A3 Quattro with Symphony Stereo

• Single DIN Install Dash Kit
• Compatible with select 2006-2010 A3 and A3 Quattro
• Works on vehicles with symphony stereo
• Accommodates ISO Single DIN Mount
• Painted to Match Factory Dash Color
• High-Grade ABS Plastic Construction
• Factory Style Texture

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List price $64.00
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• Single DIN Install Dash Kit
• Compatible with select 2006-2010 A3 and A3 Quattro
• Works on vehicles with symphony stereo
• Accommodates ISO Single DIN Mount
• Painted to Match Factory Dash Color
• High-Grade ABS Plastic Construction
• Factory Style Texture

Scosche AU2392B Dash Kit

Install a new Single-DIN car stereo in select 2006-2019 A3 Quattro and A3 (Black)

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Install a new Single-DIN car stereo in select 2006-2019 A3 Quattro and A3 (Black)

• Single-DIN Dash Kit
• Painted scratch-resistant black
• High-Grade ABS plastic construction
• Original factory-like fit and finish
• Includes installation instructions

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• Single-DIN Dash Kit
• Painted scratch-resistant black
• High-Grade ABS plastic construction
• Original factory-like fit and finish
• Includes installation instructions

Metra 40-EU66 Antenna Adapter

Connect Aftermarket Antenna to Factory Stereo via European-Style Dual FAKRA Antenna Adapter in select 2005-2025 vehicles from BMW, Audi, Volkswagen

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Connect Aftermarket Antenna to Factory Stereo via European-Style Dual FAKRA Antenna Adapter in select 2005-2025 vehicles from BMW, Audi, Volkswagen

• European-style dual FAKRA antenna adapter
• Compatible with select 2005-2025 vehicles from BMW, Audi, Volkswagen
• Adapts vehicle's factory stereo to use with an aftermarket antenna
• Works with 40-EU56 for installations of FM modulators
• Easy installation, no major modification required

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• European-style dual FAKRA antenna adapter
• Compatible with select 2005-2025 vehicles from BMW, Audi, Volkswagen
• Adapts vehicle's factory stereo to use with an aftermarket antenna
• Works with 40-EU56 for installations of FM modulators
• Easy installation, no major modification required

Metra 40-VW20 Antenna Adapter

Connect your factory antenna to a new aftermarket radio for select 1982-2025 vehicles from Audi, Mercedes-Benz, Volkswagen

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Connect your factory antenna to a new aftermarket radio for select 1982-2025 vehicles from Audi, Mercedes-Benz, Volkswagen

• Factory Radio to Aftermarket Antenna Adapter
• Compatible with select 1982-2025 vehicles from Audi, Mercedes-Benz, Volkswagen Vehicles

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• Factory Radio to Aftermarket Antenna Adapter
• Compatible with select 1982-2025 vehicles from Audi, Mercedes-Benz, Volkswagen Vehicles

Metra 99-9109B

Single DIN or Double DIN Stereo Dash Kit for select 2006-2013 A3

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Single DIN or Double DIN Stereo Dash Kit for select 2006-2013 A3

• Single & Double DIN Install Dash Kit
• Compatible with select 2006-2013 A3
• Accommodates ISO Single & Double DIN mount
• Painted to match factory dash color
• High-Grade ABS plastic construction
• Factory style texture

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• Single & Double DIN Install Dash Kit
• Compatible with select 2006-2013 A3
• Accommodates ISO Single & Double DIN mount
• Painted to match factory dash color
• High-Grade ABS plastic construction
• Factory style texture

PAC EU08

Connect Factory Antenna to a New Aftermarket Stereo for select 2000-2025 vehicles from Volkswagen, Chevrolet, Audi

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Connect Factory Antenna to a New Aftermarket Stereo for select 2000-2025 vehicles from Volkswagen, Chevrolet, Audi

• Wiring harness to install a new stereo
• Compatible with select 2000-2025 vehicles from Volkswagen, Chevrolet, Audi
• Retains the factory antenna
• Plugs into the factory harness

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• Wiring harness to install a new stereo
• Compatible with select 2000-2025 vehicles from Volkswagen, Chevrolet, Audi
• Retains the factory antenna
• Plugs into the factory harness

Metra 99-9106 Dash Kit

Install a new Single-DIN car stereo in select 1996-2007 vehicles from Audi

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Install a new Single-DIN car stereo in select 1996-2007 vehicles from Audi

• Single-DIN Dash Kit
• High-Grade ABS plastic construction
• Original factory-like fit and finish
• Includes installation instructions

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• Single-DIN Dash Kit
• High-Grade ABS plastic construction
• Original factory-like fit and finish
• Includes installation instructions

Axxess AXDI-A12 Wiring Interface

Install a New Car Stereo and Retain Factory Features in select 2002-2013 vehicles from Audi

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Install a New Car Stereo and Retain Factory Features in select 2002-2013 vehicles from Audi

• Wiring interface to install aftermarket stereo in select 2002-2013 vehicles from Audi
• Designed for non-amplified and amplified systems
• Provides accessory power and NAV outputs
• Retains R.A.P, balance and fade, and chimes
• Pre-wired AXSWC harness (AXSWC sold separately)

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• Wiring interface to install aftermarket stereo in select 2002-2013 vehicles from Audi
• Designed for non-amplified and amplified systems
• Provides accessory power and NAV outputs
• Retains R.A.P, balance and fade, and chimes
• Pre-wired AXSWC harness (AXSWC sold separately)

Scosche LAI10 Wiring Interface

Install new car stereo and retain steering wheel audio controls in select 2004-2023 vehicles from Audi

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Install new car stereo and retain steering wheel audio controls in select 2004-2023 vehicles from Audi

• Provides 12-Volt accessory power (RAP)
• Retains steering wheel control
• Micro-B USB Updatable

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• Provides 12-Volt accessory power (RAP)
• Retains steering wheel control
• Micro-B USB Updatable

Metra 40-VW54 Antenna Adapter

Connect your factory antenna to a new aftermarket radio for select 1973-2020 vehicles from Audi, BMW, Volkswagen

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Connect your factory antenna to a new aftermarket radio for select 1973-2020 vehicles from Audi, BMW, Volkswagen

• Volkswagen Aftermarket Antenna Adapter
• Compatible with select 1973-2020 vehicles from Audi, BMW, Volkswagen Vehicles
• Coax cable powered amplified antenna

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• Volkswagen Aftermarket Antenna Adapter
• Compatible with select 1973-2020 vehicles from Audi, BMW, Volkswagen Vehicles
• Coax cable powered amplified antenna

iDataLink HRN-HRR-AU1

Install a New Car Stereo in select 2002-2015 vehicles from Audi (Requires ADS-MRR or ADS-MRR2 Module)

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Install a New Car Stereo in select 2002-2015 vehicles from Audi (Requires ADS-MRR or ADS-MRR2 Module)

• Fits select 2002-2015 vehicles from Audi
• Designed for use with iDataLink ADS-MRR or iDataLink ADS-MRR2 module (Sold separately)
• Retains select factory features
• Provides navigation and illumination outputs

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• Fits select 2002-2015 vehicles from Audi
• Designed for use with iDataLink ADS-MRR or iDataLink ADS-MRR2 module (Sold separately)
• Retains select factory features
• Provides navigation and illumination outputs

iDataLink Maestro HRN-SR-AU1 Wiring Harness

Install a New Car Stereo in select 2002-2007 vehicles from Audi (Requires Maestro SR Module)

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Install a New Car Stereo in select 2002-2007 vehicles from Audi (Requires Maestro SR Module)

• Fits select 2002-2007 vehicles from Audi
• Designed for use with iDataLink ADS-MSR module (Sold separately)
• Retains factory amplifier and steering wheel controls
• Provides accessory power, navigation and illumination outputs

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• Fits select 2002-2007 vehicles from Audi
• Designed for use with iDataLink ADS-MSR module (Sold separately)
• Retains factory amplifier and steering wheel controls
• Provides accessory power, navigation and illumination outputs

Crux SWRAD-55 Wiring Interface

Install new car stereo and retains steering wheel audio controls and other factory features in select 2000-2010 vehicles from Audi

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Install new car stereo and retains steering wheel audio controls and other factory features in select 2000-2010 vehicles from Audi

• Provides 12-Volt accessory power (RAP)
• Designed for non-amplified and amplified models
• Micro-B USB Updatable
• Pre-programmed to retain factory Steering Wheel Controls
• Color coded wires for easy installation
• No cutting or splicing required

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• Provides 12-Volt accessory power (RAP)
• Designed for non-amplified and amplified models
• Micro-B USB Updatable
• Pre-programmed to retain factory Steering Wheel Controls
• Color coded wires for easy installation
• No cutting or splicing required

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    FAQ Frequently asked questions in Car Stereo Installation & Accessories


    In most modern vehicles, the factory radio is part of a larger, integrated dash panel rather than a standardized rectangular box. A vehicle-specific dash kit provides the necessary brackets and trim pieces to adapt the universal ISO-mount of an aftermarket stereo to the unique shape and mounting points of your dashboard.

    Choosing the right Car Stereo Installation & Accessories begins with understanding your vehicle's make, model, and year. This information helps you select compatible wiring harnesses and mounting kits. Next, consider your audio preferences. If you're looking to upgrade your car's sound system significantly, opt for an amplifier installation kit that matches your amplifier's power requirements.Additionally, check the head unit's compatibility with your smartphone and other devices.

    Features like Bluetooth connectivity, Apple CarPlay, or Android Auto can greatly enhance your driving experience. Ensure that the accessories you choose align with your car audio goals, whether it's improved sound quality, convenience, or connectivity.

    Not if you use a Steering Wheel Control (SWC) interface. These modules translate the signals from your factory buttons into a language your new stereo understands. Many modern integration harnesses, like the iDatalink Maestro, include this functionality along with the ability to display engine data and tire pressure on your new screen.
    We strongly recommend using a wiring harness. Cutting factory wires is permanent, increases the risk of short circuits, and can void your vehicle's electrical warranty. A harness allows you to do all your soldering or crimping on the bench, then simply plug the new assembly into the factory connector without damaging the car's original wiring.

    Safety is paramount during Car Stereo Installation & Accessories installation. Start by disconnecting the car's battery to avoid electrical accidents. When handling wiring and electrical connections, follow proper insulation techniques to prevent short circuits or fires. Secure all cables and wires away from moving parts like steering columns and pedals.

    During the installation of amplifiers and subwoofers, ensure that they are securely mounted to prevent movement while driving. Avoid drilling into gas tanks, brake lines, or other sensitive areas when installing components. It's also a good practice to have a fire extinguisher and a first aid kit on hand in case of emergencies.

    All About

    Car Stereo Installation & Accessories

    Navigating the hardware required for a radio swap can be confusing. To get the job done right the first time, it's helpful to understand the specific role each accessory plays in the signal chain and the physical assembly.

    Dash Kits: The Cosmetic Foundation

    The dash kit is what ensures your new stereo doesn't look like an afterthought. These kits are engineered to match the exact color, texture, and contour of your factory dash.

    • Single-DIN Kits: Feature a 2-inch tall opening, often including a storage pocket to fill the extra space.
    • Double-DIN Kits: Feature a 4-inch tall opening designed for large touchscreens and multimedia receivers.
    • Multi-Kits: Versatile designs that can be configured for either size depending on your hardware choice.

    Wiring Harnesses and Data Interfaces

    The wiring harness is the electrical nervous system of your install.

    • Standard Harnesses: Provide basic power, ground, and speaker connections for older vehicles.
    • Data Interfaces: Required for modern vehicles with CAN-bus systems. These modules "talk" to the car’s computer to provide a 12V switched power source (which many new cars lack at the radio) and retain safety features like door chimes, OnStar, or factory amplifiers.

    Steering Wheel and Camera Retention

    Convenience and safety shouldn't be sacrificed for better sound. Dedicated interfaces allow you to keep your hands on the wheel and your eyes on the screen when reversing. If your vehicle has a factory backup camera, a camera retention adapter allows you to feed that video signal directly into your new touchscreen's RCA input.

    Professional Installation Tools

    Using the wrong tools can lead to cracked plastic or scratched leather. A set of nylon trim removal tools is essential for prying off dash panels without leaving permanent pry marks. Additionally, we recommend high-quality crimp connectors or heat-shrink tubing to ensure your electrical connections remain stable through years of vehicle vibration.

    The Sonic Electronix Advantage

    We take the guesswork out of the DIY process. When you use our vehicle selector, we don't just show you parts that "might" work; we curate a list of accessories verified to fit your specific cabin. As an Authorized Online Retailer for reputable brands, every interface and kit we sell is backed by full technical support to help you through the trickiest parts of your installation.

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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.