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 air and fuel Parts
502 parts available
Shop aftermarket parts for the Audi A4. Verified fitment, free shipping, 30-day returns.
Dorman
AIR CHECK VALVE

Dorman
TURBO OIL INLET

WIX
FUEL FILTER MIN ORDER QTY1

Bosch
SPICER U JOINT PRESS
Bosch
OXYGEN SENSOR

Bosch
OXYGEN SENSOR

Bosch
PLANAR SENSOR

Bosch
FORD CRANKSHAFT TOOL
Hella
LAMBDA PROBE
Hella
ELECTRIC FUEL PUMP WITH ACCESSORIES

Hella
SECONDARY AIR PUMP

Bosch
OXYGEN SENSOR

NGK
NTK MASS AIR FLOW SENSOR

Denso
O2 OXYGEN SENSOR

Hella
AIR MASS SENSOR
Bosch
THROTTLE-VALVE SWITC

Bosch
OXYGEN SENSOR

Hella
AIR MASS SENSOR

Hella
CONTROL UNIT FUEL PUMP
Clevite
TURBOCHARGERS

Bosch
MAF SENSOR
Clevite
LOW-TEMPERATURE RADIATOR

Gates
Gates 2 1/4in x 2 19/32in x 17 1/4in
NGK
THROTTLE POSITION SENSOR

Bosch
GASOLINE INJECTOR

Mahle
Intercooler
Bosch
BLUETOOTH TEMPERATURE PROBE 2 PACK

Bosch
OXYGEN SENSOR

NGK
NTK MASS AIR FLOW SENSOR

Hella
FUEL FEED UNIT
Bosch
PULLER LEG SET (34' LONG)

Bosch
OXYGEN SENSOR

Bosch
OXYGEN SENSOR

Hella
LAMBDA SENSOR

Hella
ELECTRIC DRIVE MODULE

Hella
AIR PRESSURE SENSOR
Hella
CONTROL UNIT FOR FUEL PUMP

Hella
AIR MASS SENSOR

Hella
AIR MASS SENSOR

Hella
SOLENOID VALVE VW/AUDI

Bosch
MAF SENSOR
Hella
AIR MASS SENSOR BOLTED FOR AUDI/VW

Hella
SENSOR AIR FLOW AUDI

Hella
LAMBDA SENSOR

Denso
OXYGEN SENSOR

Industrial Injection
GT2860RS Turbocharger Serv
Mahle
Intercooler
Dorman
ELECTRIC AIR PUMP

Denso
O2 OXYGEN SENSOR

NGK
TURBOCHARGER BOOST SENSOR

Mahle
Intercooler
Bosch
MAF SENSOR

Bosch
THROTTLE-VALVE SWITC
Industrial Injection
K04

Bosch
OXYGEN SENSOR

Bosch
OXYGEN SENSOR

NGK
MANIFOLD ABSOLUTE PRESSURE SENSOR

NGK
NTK O2 SENSOR OE IDENTICAL
Clevite
TURBOCHARGERS

Denso
O2 OXYGEN SENSOR
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