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 ignitions and electrical Parts

301 parts available

Shop aftermarket parts for the Audi A4. Verified fitment, free shipping, 30-day returns.

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D

Dorman

HIGH INTENSITY DISCHARGE CONTROL BA

Bosch auto part

Bosch

STARTER BATTERY

IGNITION COIL

Hella

IGNITION COIL

Bosch auto part

Bosch

REMAN ALTERNATOR

N

NGK

ACCELERATOR PEDAL SENSOR

N

NGK

ABS WHEEL SPEED SENSOR

B

Bosch

CYLINDER LINER INSTALLER

RaceChip black auto part

RaceChip

PERFORMANCE TUNING CHIP - GTS BLACK

RaceChip auto part

RaceChip

PERFORMANCE TUNING CHIP - RS + APP

RaceChip auto part

RaceChip

PERFORMANCE TUNING CHIP - S

Bosch auto part

Bosch

SPARK PLUG

B

Bosch

BOSCH PREMIUM 100% REMANUFACTURED A

RaceChip auto part

RaceChip

PERFORMANCE TUNING CHIP - RS

R

RaceChip

XLR WITH APP

CONTROL UNIT GLOW PLU... FOR VW/AU

Hella

CONTROL UNIT GLOW PLU... FOR VW/AU

R

RaceChip

PERFORMANCE TUNING CHIP - GTS

Bosch auto part

Bosch

RE ALTERNATOR

PERFORMANCE TUNING CHIP - S

RaceChip

PERFORMANCE TUNING CHIP - S

Bosch auto part

Bosch

REMAN ALTERNATOR

Bosch auto part

Bosch

RE ALTERNATOR

B

Bosch

RE STARTER

RaceChip auto part

RaceChip

PERFORMANCE TUNING CHIP - GTS + APP

Bosch auto part

Bosch

RAM MOUNTING PLATE

B

Bosch

PARTS SET

KIT 6537 BRG INSTALLER

Bosch

KIT 6537 BRG INSTALLER

B

Bosch

RE STARTER

Hella auto part

Hella

ACCELERATOR PEDAL POSITION SENSOR F

H

Hella

ALTERNATOR 14V

RaceChip auto part

RaceChip

XLR - NO APP

RaceChip auto part

RaceChip

PERFORMANCE TUNING CHIP - RS + APP

Bosch auto part

Bosch

REMAN STARTER

R

RaceChip

XLR WITH APP

PERFORMANCE TUNING CHIP - GTS + APP

RaceChip

PERFORMANCE TUNING CHIP - GTS + APP

Bosch red auto part

Bosch

BOSCH PREMIUM 100% REMANUFACTURED A

D

Denso

DENSO FIRST TIME FIT STARTER MOTOR

D

Denso

DENSO FIRST TIME FIT STARTER MOTOR

PERFORMANCE TUNING CHIP - S

RaceChip

PERFORMANCE TUNING CHIP - S

H

Hella

SENSOR ACCELERATOR PE... FOR VW/AU

R

RaceChip

PERFORMANCE TUNING CHIP - RS

PERFORMANCE TUNING CHIP - RS

RaceChip

PERFORMANCE TUNING CHIP - RS

REMAN STARTER

Bosch

REMAN STARTER

Bosch auto part

Bosch

RE STARTER

H

Hella

ALTERNATOR 14V

SENSOR BATTERY MANAGEMENT

Hella

SENSOR BATTERY MANAGEMENT

H

Hella

ALTERNATOR

BATTERY SENSOR IBS200X AUDI

Hella

BATTERY SENSOR IBS200X AUDI

Hella auto part

Hella

1217 AUDI A4 QUATTRO/PORSCHE MACAN BODY CONTROL MODULE LANE CHANGE ASSIST

Bosch auto part

Bosch

RE ALTERNATOR

OXYGEN SENSOR

Bosch

OXYGEN SENSOR

SPARK PLUG WIRE SET

Bosch

SPARK PLUG WIRE SET

Bosch auto part

Bosch

RE ALTERNATOR

Bosch auto part

Bosch

NEW STARTER

NGK side steps

NGK

NGK Iridium Spark Plug One Step Colder 2667 Subaru WRX 2002-2005

H

Hella

STARTER 12V

H

Hella

ALTERNATOR 14V 140A

H

Hella

ALTERNATOR 12V 140A

Bosch auto part

Bosch

REMAN STARTER

Bosch auto part

Bosch

NEW STARTER

WATER CIRCULATING PUMP

Hella

WATER CIRCULATING PUMP

B

Bosch

PARTS SET

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