QUATTRO MEETS PRACTICALITY

B5 through B9 — Audi's compact sedan with available Quattro AWD and turbo power.

Audi A4 HERITAGE

THE QUATTRO COMPACT

The Audi A4 has been the German compact sport sedan since 1994. The B5 (1.8T) launched the tuner-friendly chassis, the B6/B7 added the K04 turbo upgrade culture, and the B8/B9 brought EA888 turbocharged 2.0T engines that share parts with the VW Golf R / Jetta GLI.

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

3,135
Parts that fit
3,000+
MOTORMIA Builds
EBC
#1 brand by SKUs
$711
Average MSRP

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.

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30-Day Returns
D

Dorman

AIR CHECK VALVE

TURBO OIL INLET

Dorman

TURBO OIL INLET

FUEL FILTER MIN ORDER QTY1

WIX

FUEL FILTER MIN ORDER QTY1

Bosch auto part

Bosch

SPICER U JOINT PRESS

B

Bosch

OXYGEN SENSOR

OXYGEN SENSOR

Bosch

OXYGEN SENSOR

PLANAR SENSOR

Bosch

PLANAR SENSOR

FORD CRANKSHAFT TOOL

Bosch

FORD CRANKSHAFT TOOL

H

Hella

LAMBDA PROBE

H

Hella

ELECTRIC FUEL PUMP WITH ACCESSORIES

Hella auto part

Hella

SECONDARY AIR PUMP

OXYGEN SENSOR

Bosch

OXYGEN SENSOR

NTK MASS AIR FLOW SENSOR

NGK

NTK MASS AIR FLOW SENSOR

O2 OXYGEN SENSOR

Denso

O2 OXYGEN SENSOR

AIR MASS SENSOR

Hella

AIR MASS SENSOR

B

Bosch

THROTTLE-VALVE SWITC

OXYGEN SENSOR

Bosch

OXYGEN SENSOR

AIR MASS SENSOR

Hella

AIR MASS SENSOR

CONTROL UNIT FUEL PUMP

Hella

CONTROL UNIT FUEL PUMP

C

Clevite

TURBOCHARGERS

MAF SENSOR

Bosch

MAF SENSOR

C

Clevite

LOW-TEMPERATURE RADIATOR

Gates auto part

Gates

Gates 2 1/4in x 2 19/32in x 17 1/4in

N

NGK

THROTTLE POSITION SENSOR

GASOLINE INJECTOR

Bosch

GASOLINE INJECTOR

Intercooler

Mahle

Intercooler

B

Bosch

BLUETOOTH TEMPERATURE PROBE 2 PACK

OXYGEN SENSOR

Bosch

OXYGEN SENSOR

NTK MASS AIR FLOW SENSOR

NGK

NTK MASS AIR FLOW SENSOR

FUEL FEED UNIT

Hella

FUEL FEED UNIT

B

Bosch

PULLER LEG SET (34' LONG)

Bosch auto part

Bosch

OXYGEN SENSOR

OXYGEN SENSOR

Bosch

OXYGEN SENSOR

LAMBDA SENSOR

Hella

LAMBDA SENSOR

Hella auto part

Hella

ELECTRIC DRIVE MODULE

AIR PRESSURE SENSOR

Hella

AIR PRESSURE SENSOR

H

Hella

CONTROL UNIT FOR FUEL PUMP

AIR MASS SENSOR

Hella

AIR MASS SENSOR

AIR MASS SENSOR

Hella

AIR MASS SENSOR

SOLENOID VALVE VW/AUDI

Hella

SOLENOID VALVE VW/AUDI

MAF SENSOR

Bosch

MAF SENSOR

H

Hella

AIR MASS SENSOR BOLTED FOR AUDI/VW

SENSOR AIR FLOW AUDI

Hella

SENSOR AIR FLOW AUDI

LAMBDA SENSOR

Hella

LAMBDA SENSOR

Denso auto part

Denso

OXYGEN SENSOR

Industrial Injection auto part

Industrial Injection

GT2860RS Turbocharger Serv

M

Mahle

Intercooler

D

Dorman

ELECTRIC AIR PUMP

O2 OXYGEN SENSOR

Denso

O2 OXYGEN SENSOR

NGK auto part

NGK

TURBOCHARGER BOOST SENSOR

Mahle intercooler

Mahle

Intercooler

B

Bosch

MAF SENSOR

THROTTLE-VALVE SWITC

Bosch

THROTTLE-VALVE SWITC

I

Industrial Injection

K04

OXYGEN SENSOR

Bosch

OXYGEN SENSOR

OXYGEN SENSOR

Bosch

OXYGEN SENSOR

MANIFOLD ABSOLUTE PRESSURE SENSOR

NGK

MANIFOLD ABSOLUTE PRESSURE SENSOR

NTK O2 SENSOR OE IDENTICAL

NGK

NTK O2 SENSOR OE IDENTICAL

C

Clevite

TURBOCHARGERS

O2 OXYGEN SENSOR

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.

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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