Garage
Shop
Account Icon
Account
Box Icon
Track
order
Telephone Icon
Call
Help Icon
Help
Door with Arrow Icon
Sign In

2003 Audi A4 Quattro

Change vehicle | Remove vehicle

Overview Upgrade your Speakers Add a Subwoofer Add an Amplifier Digital Sound Processors Audio Installation & Accessories Add a Backup Camera Dads & Grads Sale


Alternatively, you can email our vehicle research team to find an alternate upgrades below.

Shop other products for your 2003 Audi A4 Quattro

Subwoofer that fits 2003 Audi A4 Quattro

Subwoofers and Boxes

Find the best sub for your 2003 A4 Quattro and you'll add bass and fuller sound to your Audi.

Amplifiers and Amp Accessories

Amplifier and Amp Accessories

Amplifiers and amp accessories for your A4 Quattro like bypass harnesses, DSPs and line output converters needed to add an amp.

Audio installation and accessories

Audio Installation & Accessories

Install car audio in your 2003 A4 Quattro and make sure to get the parts and accessories that fit.

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

2003 Audi A4 Quattro

2006 Ford Freestar

2004 Toyota Sequoia

2000 Dodge Caravan

1994 Eagle Talon

2013 Scion xB

1997 Ford Mustang

2016 Nissan Leaf

2012 Nissan NV Cargo

2002 Nissan Pathfinder

Vehicle
Store Delete

1999 Harley Davidson FXD/I Dyna Super Glide

Vehicle
Store Delete

2024 Polaris General XP 1000 Ultimate

2018 Can-Am Defender HD10

2021 Can-Am Defender MAX HD8 DPS

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

Cancel

This page was not designed for products.
If you continue, you will be redirected to a category customized for your vehicle. Continue

Cancel

Shop your 2003 A4 Quattro
Why Use a Vehicle Fit Guide?
Change vehicle | Shop without vehicle
Whoa! Slow down. Add your details below!
additional information required
Add vehicle details to confirm fitment
Ignore fitment details
Find stereos and more that work -- fast.

Additional information:

Remove

Can't find your vehicle? Click here and we'll help.

Where to find vehicle info

Go to Fitment

Didn't find your car?

Submit your details and we'll help!
Please enter the letters as they are shown in the image above. Letters are not case-sensitive.
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
Back

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.

Back
Track your order
Call our experts
Support Center
Return & Exchanges
Follow on Instagram Instagram logo
Subscribe on YouTube YouTube logo