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 ignitions and electrical Parts
301 parts available
Shop aftermarket parts for the Audi A4. Verified fitment, free shipping, 30-day returns.
Dorman
HIGH INTENSITY DISCHARGE CONTROL BA

Bosch
STARTER BATTERY

Hella
IGNITION COIL

Bosch
REMAN ALTERNATOR
NGK
ACCELERATOR PEDAL SENSOR
NGK
ABS WHEEL SPEED SENSOR
Bosch
CYLINDER LINER INSTALLER

RaceChip
PERFORMANCE TUNING CHIP - GTS BLACK

RaceChip
PERFORMANCE TUNING CHIP - RS + APP

RaceChip
PERFORMANCE TUNING CHIP - S

Bosch
SPARK PLUG
Bosch
BOSCH PREMIUM 100% REMANUFACTURED A

RaceChip
PERFORMANCE TUNING CHIP - RS
RaceChip
XLR WITH APP

Hella
CONTROL UNIT GLOW PLU... FOR VW/AU
RaceChip
PERFORMANCE TUNING CHIP - GTS

Bosch
RE ALTERNATOR

RaceChip
PERFORMANCE TUNING CHIP - S

Bosch
REMAN ALTERNATOR

Bosch
RE ALTERNATOR
Bosch
RE STARTER

RaceChip
PERFORMANCE TUNING CHIP - GTS + APP

Bosch
RAM MOUNTING PLATE
Bosch
PARTS SET

Bosch
KIT 6537 BRG INSTALLER
Bosch
RE STARTER

Hella
ACCELERATOR PEDAL POSITION SENSOR F
Hella
ALTERNATOR 14V

RaceChip
XLR - NO APP

RaceChip
PERFORMANCE TUNING CHIP - RS + APP

Bosch
REMAN STARTER
RaceChip
XLR WITH APP

RaceChip
PERFORMANCE TUNING CHIP - GTS + APP

Bosch
BOSCH PREMIUM 100% REMANUFACTURED A
Denso
DENSO FIRST TIME FIT STARTER MOTOR
Denso
DENSO FIRST TIME FIT STARTER MOTOR

RaceChip
PERFORMANCE TUNING CHIP - S
Hella
SENSOR ACCELERATOR PE... FOR VW/AU
RaceChip
PERFORMANCE TUNING CHIP - RS

RaceChip
PERFORMANCE TUNING CHIP - RS

Bosch
REMAN STARTER

Bosch
RE STARTER
Hella
ALTERNATOR 14V

Hella
SENSOR BATTERY MANAGEMENT
Hella
ALTERNATOR

Hella
BATTERY SENSOR IBS200X AUDI

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

Bosch
RE ALTERNATOR

Bosch
OXYGEN SENSOR

Bosch
SPARK PLUG WIRE SET

Bosch
RE ALTERNATOR

Bosch
NEW STARTER

NGK
NGK Iridium Spark Plug One Step Colder 2667 Subaru WRX 2002-2005
Hella
STARTER 12V
Hella
ALTERNATOR 14V 140A
Hella
ALTERNATOR 12V 140A

Bosch
REMAN STARTER

Bosch
NEW STARTER

Hella
WATER CIRCULATING PUMP
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