Garage
Shop

2003 Audi A6

Universal gear includes car amplifiers, subs, and other products that do not install in a specific location or require fitment to integrate with a vehicle.

Universal-Fit Audio for 2003 Audi A6

When thinking of universal gear, we consider products like a car amp that gives more power to your speakers or subs, cell phone chargers, equalizers and sound processors, rear-seat entertainment and video monitors, as well as dash cameras.

Loading...
Filters

We are sorry, no available results!

filter-icon Filters & Sort

Metra 76-0300

3-Way Universal Waterproof Connector

76-0300 big
Go to item page Right Arrow Icon of Right Arrow

3-Way Universal Waterproof Connector

• 3-Way Universal Waterproof Connector
• Radio Wiring Harness
• Quick & Easy Installation
• No Cutting Required
• Universal Compatibility
• Waterproof

shipping truck icon Free shipping in USA. Provide zip for delivery date.

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

List price $29.99
-10% $26.99

In stock

Only 1 Left!

• 3-Way Universal Waterproof Connector
• Radio Wiring Harness
• Quick & Easy Installation
• No Cutting Required
• Universal Compatibility
• Waterproof

Metra MPS-RGBWWK

RGB Pod LED String Kit (Set of 4)

MPS-RGBWWK big
Go to item page Right Arrow Icon of Right Arrow

RGB Pod LED String Kit (Set of 4)

• RGB LED Wheel Well Pod String Kit
• Four sets of LED pod string lights
• Two 72" extension cables
• Hideaway RGB controller Metra MPS-RGBC-4 included
• Control LED illumination with LED controller phone app

shipping truck icon Free shipping in USA. Provide zip for delivery date.
VIP Star Icon

VIP Product Get $17.70 in rewards to spend later

Universal Icon
Universal – fits most vehicles.
Shop similar products or Update vehicle
List price $196.99
-10% $176.99

In stock.

• RGB LED Wheel Well Pod String Kit
• Four sets of LED pod string lights
• Two 72" extension cables
• Hideaway RGB controller Metra MPS-RGBC-4 included
• Control LED illumination with LED controller phone app

Metra MPS-3PB

4-Gauge Power and Ground Quick Disconnect Block

MPS-3PB big
Go to item page Right Arrow Icon of Right Arrow

4-Gauge Power and Ground Quick Disconnect Block

• Quick disconnect power and ground block
• Accepts 4-gauge power and ground wires
• Machined brass block

shipping truck icon Free shipping in USA. Provide zip for delivery date.

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

List price $28.99
-10% $25.99

In stock

Only 3 Left!

• Quick disconnect power and ground block
• Accepts 4-gauge power and ground wires
• Machined brass block

Metra 44-UP58 Antenna

Replacement Antenna for Select Universal Pillar Mount Applications

44-UP58 big
Go to item page Right Arrow Icon of Right Arrow

Replacement Antenna for Select Universal Pillar Mount Applications

• Pillar Mount Replacement Antenna for AM/FM Bands
• 50" 3-Section Retractable Mast

shipping truck icon Free shipping in USA. Provide zip for delivery date.
Universal Icon
Universal – fits most vehicles.
Shop similar products or Update vehicle
3
List price $46.99
-11% $41.99

In stock

• Pillar Mount Replacement Antenna for AM/FM Bands
• 50" 3-Section Retractable Mast

Metra HE-VICS1

Headlight for 2007-2015 Victory Motorcycles with Silver Front Face

HE-VICS1 big
Go to item page Right Arrow Icon of Right Arrow

Headlight for 2007-2015 Victory Motorcycles with Silver Front Face

• Wattage: 60 Watt High Beam – 40 Watt Low Beam
• 2800LM Low Beam – Draws 2.9a at 13.8v
• 3450LM High Beam – Draws 4.3a at 13.8v
• LED Color: 6500k
• Lens: polycarbonate
• Housing: Die-cast aluminum

shipping truck icon Free shipping in USA. Provide zip for delivery date.

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

List price $187.55
-26% $137.99

In stock

Only 1 Left!

• Wattage: 60 Watt High Beam – 40 Watt Low Beam
• 2800LM Low Beam – Draws 2.9a at 13.8v
• 3450LM High Beam – Draws 4.3a at 13.8v
• LED Color: 6500k
• Lens: polycarbonate
• Housing: Die-cast aluminum

Metra 44-UL105 Antenna

1-3/4" Top Mount Universal Locking Antenna For Select BMW, Mercedes, Jaguar, Peugeot, and Porsche

44-UL105 big
Go to item page Right Arrow Icon of Right Arrow

1-3/4" Top Mount Universal Locking Antenna For Select BMW, Mercedes, Jaguar, Peugeot, and Porsche

• Replacement Locking Antenna for Select Vehicles
• 37" 5-Section Black Retractable Mast
• 48" Cable

shipping truck icon Free shipping in USA. Provide zip for delivery date.
Universal Icon
Universal – fits most vehicles.
Shop similar products or Update vehicle
1
List price $66.99
-72% $18.99

In stock

• Replacement Locking Antenna for Select Vehicles
• 37" 5-Section Black Retractable Mast
• 48" Cable

Metra 44-US13 Antenna

Side/Top Mount Replacement Antenna for AM/FM Bands

44-US13 big
Go to item page Right Arrow Icon of Right Arrow

Side/Top Mount Replacement Antenna for AM/FM Bands

• Side/Top Mount Antenna for 1" Hole Split Ball Applications
• 53" 3-Section Mast with Spring
• Color: Chrome

shipping truck icon Free shipping in USA. Provide zip for delivery date.
Universal Icon
Universal – fits most vehicles.
Shop similar products or Update vehicle
List price $64.99
-42% $37.99

In stock

• Side/Top Mount Antenna for 1" Hole Split Ball Applications
• 53" 3-Section Mast with Spring
• Color: Chrome

Metra RGBW-CB2

RGBW Control Box for RGBW2-4KT and Other Lighting Products

RGBW-CB2 big
Go to item page Right Arrow Icon of Right Arrow

RGBW Control Box for RGBW2-4KT and Other Lighting Products

• RGBW Control Box for Multiple RGBW Lighting Products
• Handles up to 10 amps of lights
• Mobile app support for Android or iOS smartphones
• 16 million color lighting options
• Compatible with Metra RGBW2-4KT and more

shipping truck icon Free shipping in USA. Provide zip for delivery date.
VIP Star Icon

VIP Product Get $14.00 in rewards to spend later

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

List price $195.99
-29% $139.99

In stock

Only 1 Left!

• RGBW Control Box for Multiple RGBW Lighting Products
• Handles up to 10 amps of lights
• Mobile app support for Android or iOS smartphones
• 16 million color lighting options
• Compatible with Metra RGBW2-4KT and more

Metra 44-UA25 Antenna

On-Glass Micro Screen AM/FM Antenna

44-UA25 big
Go to item page Right Arrow Icon of Right Arrow

On-Glass Micro Screen AM/FM Antenna

• On-Glass Hide-Away Micro Screen AM/FM Antenna
• 54" Cable

shipping truck icon Free shipping in USA. Provide zip for delivery date.
Universal Icon
Universal – fits most vehicles.
Shop similar products or Update vehicle
4
List price $73.99
-42% $42.99

Available

Ships in 10-14 days

• On-Glass Hide-Away Micro Screen AM/FM Antenna
• 54" Cable

Metra 44-EC120 Antenna Extension

120" Universal Antenna Extension Cable

44-EC120 big
Go to item page Right Arrow Icon of Right Arrow

120" Universal Antenna Extension Cable

• Universal Antenna Extender • Extends Antenna 120" (10 ft.)

shipping truck icon Free shipping in USA. Provide zip for delivery date.

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

1
List price $16.99
-47% $8.99

In stock

Only 2 Left!

• Universal Antenna Extender • Extends Antenna 120" (10 ft.)

Metra 76-0600

6 Way Waterproof Connector

76-0600 big
Go to item page Right Arrow Icon of Right Arrow

6 Way Waterproof Connector

• 6-way Universal Waterproof Connector

shipping truck icon Free shipping in USA. Provide zip for delivery date.

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

List price $38.99
-10% $34.99

In stock

Only 1 Left!

• 6-way Universal Waterproof Connector

Metra MPS-BTK1

10 PIN Bluetooth Knob for MPS Amplifiers

MPS-BTK1 big
Go to item page Right Arrow Icon of Right Arrow

10 PIN Bluetooth Knob for MPS Amplifiers

• Must use with MPS Amplifiers
• Fits industry standard opening: 1.45in x .83in
• One knob does all control features: track/volume/power/source/play/pause/pairing
• Complete wireless connection via Bluetooth® 4.0
• Play music from any media player with 3.5mm auxiliary output

shipping truck icon Free shipping in USA. Provide zip for delivery date.
VIP Star Icon

VIP Product Get $15.50 in rewards to spend later

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

1
List price $172.99
-10% $154.99

In stock

• Must use with MPS Amplifiers
• Fits industry standard opening: 1.45in x .83in
• One knob does all control features: track/volume/power/source/play/pause/pairing
• Complete wireless connection via Bluetooth® 4.0
• Play music from any media player with 3.5mm auxiliary output

Metra 44-US30 Antenna

Side/Top Mount Replacement Antenna for AM/FM Bands

44-US30 big
Go to item page Right Arrow Icon of Right Arrow

Side/Top Mount Replacement Antenna for AM/FM Bands

• Side/Top Mount Antenna for 1" Hole Split Ball Applications
• 31" 1-Section Mast with Spring

shipping truck icon Free shipping in USA. Provide zip for delivery date.
Universal Icon
Universal – fits most vehicles.
Shop similar products or Update vehicle
2
List price $57.99
-48% $29.99

In stock

• Side/Top Mount Antenna for 1" Hole Split Ball Applications
• 31" 1-Section Mast with Spring

Metra 44-UT91 Antenna

31" Narrow Base Antenna with 72" Cable for

44-UT91 big
Go to item page Right Arrow Icon of Right Arrow

31" Narrow Base Antenna with 72" Cable for

• 31" Replacement antenna for
• Designed for narrow fender applications
• Includes 72" (183cm) cable

shipping truck icon Free shipping in USA. Provide zip for delivery date.
Universal Icon
Universal – fits most vehicles.
Shop similar products or Update vehicle
List price $48.99
-39% $29.99

In stock

Only 2 Left!

• 31" Replacement antenna for
• Designed for narrow fender applications
• Includes 72" (183cm) cable

Metra IBMGLI

2-Channel RCA Mini Ground Loop Isolator

IBMGLI big
Go to item page Right Arrow Icon of Right Arrow

2-Channel RCA Mini Ground Loop Isolator

• 2-Channel mini ground loop isolator
• Easily eliminates unwanted ground loop noise
• No need for additional adapters
• Universal vehicle application

shipping truck icon Free shipping in USA. Provide zip for delivery date.

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

List price $26.99
-11% $23.99

Available

Ships in 10-14 days

• 2-Channel mini ground loop isolator
• Easily eliminates unwanted ground loop noise
• No need for additional adapters
• Universal vehicle application

Metra 44-UA46 Antenna

Amplified Electronic Roof Mount Antenna

44-UA46 big
Go to item page Right Arrow Icon of Right Arrow

Amplified Electronic Roof Mount Antenna

• Amplified Electronic Roof Mountable Antenna
• 3dB Gain • For AM/FM Bands

shipping truck icon Free shipping in USA. Provide zip for delivery date.
Universal Icon
Universal – fits most vehicles.
Shop similar products or Update vehicle
5
List price $129.99
-55% $58.99

Available

Ships in 10-14 days

• Amplified Electronic Roof Mountable Antenna
• 3dB Gain • For AM/FM Bands

Metra 76-0201

2 Way waterproof connector

76-0201 big
Go to item page Right Arrow Icon of Right Arrow

2 Way waterproof connector

• 2-way Universal Waterproof Connector

shipping truck icon Free shipping in USA. Provide zip for delivery date.

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

List price $36.99
-11% $32.99

In stock

• 2-way Universal Waterproof Connector

Metra IBWRD04

Dual 1/0-Gauge to Single 4-Gauge Input Wire Reducers

IBWRD04 big
Go to item page Right Arrow Icon of Right Arrow

Dual 1/0-Gauge to Single 4-Gauge Input Wire Reducers

• Dual 1/0-gauge input and output to 4-gauge wire reducer
• Machined brass construction with Chrome finish
• Designed for aftermarket audio upgrades in any vehicle

shipping truck icon Free shipping in USA. Provide zip for delivery date.

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

List price $47.99
-10% $42.99

Available

Ships in 10-14 days

• Dual 1/0-gauge input and output to 4-gauge wire reducer
• Machined brass construction with Chrome finish
• Designed for aftermarket audio upgrades in any vehicle

Metra HE-MDRC30

180W 30" Curved Dual Row Marine LED Lightbar

HE-MDRC30 big
Go to item page Right Arrow Icon of Right Arrow

180W 30" Curved Dual Row Marine LED Lightbar

• 30" Curved LED Light Bar • IPX-6 water-resistant rating • 90-degree flood/combo and 8-degree spot beam pattern • Integrated epoxy-encapsulated electronics • Includes rear/side brackets and mounting hardware

shipping truck icon Free shipping in USA. Provide zip for delivery date.
VIP Star Icon

VIP Product Get $61.80 in rewards to spend later

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

List price $686.99
-10% $617.99

Available

Ships in 10-14 days

• 30" Curved LED Light Bar • IPX-6 water-resistant rating • 90-degree flood/combo and 8-degree spot beam pattern • Integrated epoxy-encapsulated electronics • Includes rear/side brackets and mounting hardware

Metra 87-30-0125

Universal DIN 1/8" Border Trim

87-30-0125 big
Go to item page Right Arrow Icon of Right Arrow

Universal DIN 1/8" Border Trim

• Universal DIN 1/8" Border Trim
• Painted to match factory dash color
• High-Grade ABS plastic construction
• Factory style texture

shipping truck icon Free shipping in USA. Provide zip for delivery date.

Universal Icon Universal – fits most vehicles.

Shop similar products or Update vehicle

List price $7.99
-24% $6.10

In stock

Only 2 Left!

• Universal DIN 1/8" Border Trim
• Painted to match factory dash color
• High-Grade ABS plastic construction
• Factory style texture

Items per page: 20 40 60

    Clear all
    why-shoping-with-sonic

    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!
    Why Shop With Us?
    FAQ for Universal-Fit Audio & Electronics in 2003 A6

    Q: Can I upgrade or change the Universal-Fit Audio & Electronics in 2003 Audi A6?

    A: Yes this page includes all the best Universal-Fit Audio & Electronics that work in your A6.

    Save up to 10 different vehicles in your garage
    Vehicle
    Store
    Delete

    2003 Audi A6

    1978 Porsche 928

    2017 Kia Cadenza

    1986 Plymouth Reliant

    1999 Porsche 911

    2009 Saturn Outlook

    1984 Ford LTD Crown

    1993 GMC C1500

    2000 BMW 740i

    1986 Mazda 626

    Vehicle
    Store
    Delete

    2012 Harley Davidson XR1200X

    2009 Triumph Rocket III

    Vehicle
    Store
    Delete

    2015 Can-Am Commander E LSV SE

    2025 Can-Am Defender XT HD9

    Add vehicle Clear all vehicles
    Where to find vehicle info
    Are you sure you want to clear your garage?
    This action cannot be undone. Confirm
    This category was not designed for products.
    If you continue, you will be redirected to a category customized for your vehicle. Continue
    Loading...
    Identify your vehicle and submodel details
    • Owner's manual
    • Vehicle's insurance card
    • Vehicle registration
    • Vehicle produced after 2005: Inside driver's side door
    • Vehicle produced before 2005: Rear passenger doorjamb, glove box, center console, or engine compartment
    Car Info Side Door Icon
    Vehicle Registration Icon
    Vehicle Insurance Icon

    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.