QUATTRO MEETS PRACTICALITY
B5 through B9 — Audi's compact sedan with available Quattro AWD and turbo power.
Audi A4 HERITAGE
THE QUATTRO COMPACT
MOTORMIA A4 builds span B5 1.8T stage-3 tuners, B7 RS4 V8 swap projects, B8/B9 ECU-tuned dailies, and the S4 supercharged V6 generation. Many parts cross-fit with VW MK6/MK7 platforms.
Audi A4 ON MOTORMIA
THE NUMBERS
CATEGORIES
Top product categories for the Audi A4
BRANDS
Top brands for Audi A4 builds
READY TO BUILD YOUR AUDI A4?
Pick your year and trim to shop verified-fit Audi A4 parts.
Shop all Audi A4 parts →Verified Fitment
Audi A4 Category exhaust Parts
238 parts available
Shop aftermarket parts for the Audi A4. Verified fitment, free shipping, 30-day returns.

AWE Tuning
AWE Tuning B9 A4 / A5 to Touring to Track Conversion Kit

Victor Reinz
MAHLE Original Audi A4 08-06 Exhaust Manifold Set

AWE Tuning
AWE Tuning Audi B8 A4 Touring Edition Exhaust - Dual Outlet Polished Silver Tips
AWE Tuning
AWE Tuning Audi B8 A4 Touring Edition Exhaust - Dual Outlet Diamond Black Tips

Victor Reinz
MAHLE Original Audi A4 06-97 Exhaust Manifold Gasket
AWE Tuning
AWE Tuning Audi B9 A5 SwitchPath Exhaust Dual Outlet - Chrome Silver Tips (Includes DP and Remote)

Magnaflow
MagnaFlow HM Grade Federal / EPA Compliant Direct-Fit Catalytic Converter 24190

Magnaflow
MagnaFlow Direct Fit Catalytic Converter 96-99 Audi A4/A4 Quattro 2.8L D/S (49 State)

Magnaflow
MagnaFlow California Grade CARB Compliant Universal Catalytic Converter 408004

Magnaflow
MagnaFlow OEM Grade Federal / EPA Compliant Universal Catalytic Converter 51654

Magnaflow
MagnaFlow 2009-2016 Audi A4 Quattro Sport Series Cat-Back Performance Exhaust System

Magnaflow
MagnaFlow California Grade CARB Compliant Universal Catalytic Converter 5461335

Magnaflow
MagnaFlow HM Grade Federal / EPA Compliant Universal Catalytic Converter 99204HM

Magnaflow
MagnaFlow California Grade CARB Compliant Direct-Fit Catalytic Converter 444333

Magnaflow
MagnaFlow HM Grade Federal / EPA Compliant Universal Catalytic Converter 99234HM

Magnaflow
MagnaFlow OEM Grade Federal / EPA Compliant Direct-Fit Catalytic Converter 51462

Magnaflow
Magnaflow Converter Universal CARB Compliant 2.25in Inlet 2.25in Outlet 16in Length

Magnaflow
MagnaFlow Conv Univ 2.25in Inlet/Outlet Center/Center Round 11in Body L x 5.125in W x 15in Overall L

Magnaflow
MagnaFlow 2005-2008 Audi A4 Quattro OEM Grade Federal / EPA Compliant Direct-Fit Catalytic Converter

Magnaflow
MagnaFlow Univ Cat Conv 2in Inlet/Outlet Ctr/Ctr Round 11in Body L x 5.125in W x 15in Overall L

Magnaflow
MagnaFlow California Grade CARB Compliant Universal Catalytic Converter 5421206

Magnaflow
MagnaFlow California Grade CARB Compliant Universal Catalytic Converter 408005

Magnaflow
MagnaFlow 2002-2005 Audi A4 Quattro HM Grade Federal / EPA Compliant Direct-Fit Catalytic Converter

Magnaflow
MagnaFlow HM Grade Federal / EPA Compliant Direct-Fit Catalytic Converter 22960

Magnaflow
MagnaFlow Direct Fit Catalytic Converter 96-99 Audi A4/A4 Quattro 2.8L P/S (49 State)

Magnaflow
MagnaFlow 2002-2008 Audi A4 Quattro Touring Series Cat-Back Performance Exhaust System

Magnaflow
MagnaFlow California Grade CARB Compliant Universal Catalytic Converter 418005

Borla
Borla Cat Back system for 02-08 Audi A4 Quattro 2.0L 4cyl

Magnaflow
MagnaFlow HM Grade Federal / EPA Compliant Universal Catalytic Converter 99355HM

Magnaflow
MagnaFlow HM Grade Federal / EPA Compliant Universal Catalytic Converter 99235HM

Magnaflow
MagnaFlow California Grade CARB Compliant Direct-Fit Catalytic Converter 4481658

Magnaflow
MagnaFlow California Grade CARB Compliant Direct-Fit Catalytic Converter 444327

Magnaflow
MagnaFlow California Grade CARB Compliant Universal Catalytic Converter 5411306

Magnaflow
MagnaFlow OEM Grade Federal / EPA Compliant Universal Catalytic Converter 51235

Magnaflow
MagnaFlow Univ Catalytic Conv Chrysler/Ford/Mercedes-Benz/Saab/Toyota/Volkswagen *CALIFORNIA OBDII*

Magnaflow
MagnaFlow HM Grade Federal / EPA Compliant Direct-Fit Catalytic Converter 24176

Magnaflow
MagnaFlow HM Grade Federal / EPA Compliant Universal Catalytic Converter 99305HM

Borla
Borla 09-15 Audi A4 Quattro Base SS Catback Exhaust

Magnaflow
MagnaFlow 2002-2005 Audi A4 Quattro HM Grade Federal / EPA Compliant Direct-Fit Catalytic Converter

Magnaflow
MagnaFlow Conv Univ 2in Inlet/Outlet Ctr/Ctr Round 9in Body L x 5.125in W x 13in Overall L 49 State

Magnaflow
MagnaFlow 2004-2006 Audi S4 Sport Series Cat-Back Performance Exhaust System

Magnaflow
MagnaFlow California Grade CARB Compliant Universal Catalytic Converter 418004

Magnaflow
MagnaFlow 2005-2008 Audi A4 Quattro HM Grade Federal / EPA Compliant Direct-Fit Catalytic Converter

Magnaflow
MagnaFlow 05-07 Audi A4 Quattro V6 3.2L SS Cat-Back Dual Split Rear Exit 2 Tips Perf Exhaust Sys

Magnaflow
MagnaFlow OEM Grade Federal / EPA Compliant Direct-Fit Catalytic Converter 52352

Magnaflow
MagnaFlow OEM Grade Federal / EPA Compliant Direct-Fit Catalytic Converter 49163

Magnaflow
MagnaFlow 2005-2008 Audi A4 Quattro OEM Grade Federal / EPA Compliant Direct-Fit Catalytic Converter

Magnaflow
MagnaFlow California Grade CARB Compliant Universal Catalytic Converter 441205

Magnaflow
MagnaFlow 2005-2009 Audi A4 Quattro HM Grade Federal / EPA Compliant Direct-Fit Catalytic Converter

Magnaflow
MagnaFlow 2002-2005 Audi A4 Quattro OEM Grade Federal / EPA Compliant Direct-Fit Catalytic Converter

Magnaflow
MagnaFlow 2002-2005 Audi A4 Quattro OEM Grade Federal / EPA Compliant Direct-Fit Catalytic Converter

Magnaflow
MagnaFlow 2005-2008 Audi A4 Quattro HM Grade Federal / EPA Compliant Direct-Fit Catalytic Converter

Magnaflow
MagnaFlow California Grade CARB Compliant Direct-Fit Catalytic Converter 4481605

Magnaflow
MagnaFlow Univ Catalytic Conv Chrysler/Ford/Mercedes-Benz/Saab/Toyota/Volkswagen *CALIFORNIA OBDII*

Magnaflow
MagnaFlow California Grade CARB Compliant Direct-Fit Catalytic Converter 5561352

Magnaflow
MagnaFlow OEM Grade Federal / EPA Compliant Direct-Fit Catalytic Converter 49135

Magnaflow
MagnaFlow 2005-2009 Audi A4 Quattro HM Grade Federal / EPA Compliant Direct-Fit Catalytic Converter

Magnaflow
MagnaFlow OEM Grade Federal / EPA Compliant Direct-Fit Catalytic Converter 49136
FAQ
Frequently Asked Questions About the Audi A4
What are the best aftermarket parts brands for the Audi A4?
The top brands MOTORMIA owners trust for Audi A4 builds are EBC, PowerStop, H&R, Bilstein, and Magnaflow. The catalog carries 3,135 parts that fit the A4. Use the fitment selector to filter to your specific year and trim, then browse by category or brand.
What's the best trim or sub-model of the Audi A4 to modify?
The most-modified A4 trims are S4 (especially B5 / B7 / B8 / B9 supercharged). These trims typically came with performance-focused suspension, brakes, and engine options that give a higher starting point. That said, the A4's engine family (1.8T, 2.0T EA888, 3.0T supercharged (S4), 4.2 V8 (B7 RS4)) shares aftermarket across most trims, so base-trim builds with the right bolt-ons can match higher trims on power.
What's the typical mod path for a Audi A4?
For most Audi A4 builds, the recommended modification order is: ECU tune → intake → downpipe → suspension → turbo upgrade. This sequence stages upgrades so each mod supports the next — tuning unlocks gains from intake/exhaust, suspension keeps the added power planted. MOTORMIA member builds let you see exact part lists for Audi A4 builds at every power level.
How does the Audi A4 aftermarket compare to the BMW 3 Series?
The Audi A4 is the Quattro AWD compact sedan with the EA888 2.0T platform shared across Audi/VW. On MOTORMIA, 3,135 parts fit the A4 across 3,000+ active member builds, with an average part MSRP of $711. The decision usually comes down to which platform you own — both have full bolt-on catalogs.
Will any Audi A4 part fit my year and trim?
Not always. The Audi A4 has had multiple generations and engine changes (e.g., 1.8T, 2.0T EA888, 3.0T supercharged (S4), 4.2 V8 (B7 RS4)), and parts are generation- and trim-specific. MOTORMIA's catalog uses verified fitment data — every product page shows exactly which years and submodels of the A4 a part fits. Use the fitment selector at the top of any page to pre-filter to your build.
Does MOTORMIA offer returns on Audi A4 parts?
Yes. Most Audi A4 parts on MOTORMIA are eligible for our 30-day return policy provided they're unused, uninstalled, and in original packaging. Special-order parts are flagged with a "Special Order" badge on the product page. Manufacturer warranties are processed through MOTORMIA on your behalf.
MOTORMIA APP
Build your Audi A4 with Mia
Personalized Audi A4 mod recommendations, verified fitment from real A4 owners, and a garage that tracks every part on your build.
- Mod recommendations tuned to your A4 year, trim, and submodel
- Verified fitment data from 3,000+ Audi A4 member builds
- Performance gain estimates based on real-world results
- Save your garage and track every part you've installed