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.

DELPHI
OXYGEN SENSOR

DELPHI
OXYGEN SENSOR
CARTER
DIRECT INJECTION FUEL PUMP

DELPHI
MAF SENSOR - PROBE ONLY

DELPHI
OXYGEN SENSOR

STANDARD IGN
MASS AIR FLOW

STANDARD IGN
INJECTOR
CARTER
AUDI A4 2017-2019

DELPHI
FUEL PUMP MODULE ASSEM

DELPHI
MASS AIR FLOW SENSOR-PROBE ONLY

DELPHI
MAF SENSOR - PROBE ONLY

DELPHI
OXYGEN SENSOR

A1 REMFG INC
IMPORT ECC
A1 REMFG INC
NEW TURBOCHARGERS

Samco
Samco Audi A4 1800 Turbo B5 AEB/ATW/AWM/AVJ (1) Induction Hose (WHITE)
Samco
Samco Audi A4 1800 Turbo B5 AEB/ATW/AWM/AVJ (1) Induction Hose (NINJAGREENCAMO)

TYC
0509 AD A.4 QATRO 2.0/3.2L FUEL MODULE

Garrett Turbos
TURBOCHARGER SERV

Garrett Turbos
TURBOCHARGER ORIGINAL REMAN GTA2052V VW GROUP
A1 REMFG INC
MASS AIR FLOW

A1 REMFG INC
MASS AIRFLOW SENSOR
A1 REMFG INC
MASS AIRFLOW SENSOR

A1 REMFG INC
MASS AIRFLOW SENSORS
A1 REMFG INC
MASS AIRFLOW SENSORS

TYC
INTERCOOLER ASSY 2.0L; SDN; W/O ULTRA ENG AUDI A4 1721; WGN AUDI A4 ALLROAD 1721; A5 QUATTRO 1821
Samco
Samco Audi A4 Turbo B6 AVJ/AMB/BFB (3) Turbo Kit (RED)
TYC
INTERCOOLER ASSY 2.0L AUDI A5 QUATTRO 1017; A4 0916; Q5 1117 ALLROAD 1316; A6 1215
Samco
Samco Volswagen Passat 1.8T B5.5 AUG US Spec (4) Turbo Kit (BLUE)

Samco
Samco Audi A4 1800 Turbo B5 AEB/ATW/AWM/AVJ (1) Induction Hose (BRG)
Samco
Samco Audi A4 Turbo B6 AVJ/AMB/BFB (3) Turbo Kit (LIGHTNINGBLUECAMO)

Samco
Samco Audi A4 Turbo B6 AVJ/AMB/BFB (3) Turbo Kit (GREEN)
Samco
Samco Audi A4 Turbo B6 AVJ/AMB/BFB (3) Turbo Kit (BLUE)
Samco
Samco Audi A4 Turbo B6 AVJ/AMB/BFB (3) Turbo Kit (BLACK)
Trans-Dapt
OLDS AND PONTIAC ENGINE KIT; OFFSET PCV; OLDS 330455 AND PONTIAC 403CHROME195964 PONTIAC ENGINES
Samco
Samco Audi A4 1800 Turbo FWD (2001) Man Trans AWM B5 US Spec (4) Turbo Kit (BLACK)
Samco
Samco Audi A4 1800 Turbo FWD (2001) Man Trans AWM B5 US Spec (4) Turbo Kit (SOLARORANGECAMO)
Samco
Samco Audi A4 1800 Turbo FWD (2001) Man Trans AWM B5 US Spec (4) Turbo Kit (URBANCAMO)
Samco
Samco Audi A4 Turbo B6 AVJ/AMB/BFB (3) Turbo Kit (BLAZE)

Samco
Samco Audi A4 1800 Turbo B5 AEB/ATW/AWM/AVJ (1) Induction Hose (BLAZE)
Samco
Samco Audi A4 1800 Turbo B5 AEB/ATW/AWM/AVJ (1) Induction Hose (SOLARORANGECAMO)

Garrett Turbos
TURBOCHARGER ORIGINAL REMAN WITH KIT GT2052V VW GROUP
Samco
Samco Audi A4 1800 Turbo FWD (2001) Man Trans AWM B5 US Spec (4) Turbo Kit (RED)

Samco
Samco Audi A4 1800 Turbo B5 AEB/ATW/AWM/AVJ (1) Induction Hose (URBANCAMO)

Samco
Samco Audi A4 1800 Turbo B5 AEB/ATW/AWM/AVJ (1) Induction Hose (GUNMETALGREY)

Samco
Samco Audi A4 1800 Turbo B5 AEB/ATW/AWM/AVJ (1) Induction Hose (BLUE)
A1 REMFG INC
TURBO CHARGERS
Samco
Samco Audi A4 1800 Turbo FWD (2001) Man Trans AWM B5 US Spec (4) Turbo Kit (YELLOW)

Samco
Samco Audi A4 Turbo B6 AVJ/AMB/BFB (3) Turbo Kit (GUNMETALGREY)

Samco
Samco Audi A4 Turbo B6 AVJ/AMB/BFB (3) Turbo Kit (URBANCAMO)

Dorman
THROTTLE BODY UNIT

Dorman
SECONDARY AIR INJECTION CHECK VALVE

Dorman
COMBINATION VALVE

Dorman
TURBOCHARGER COOLANT FEED LINE

Dorman
TURBO LINE

Dorman
TURBOCHARGER

Dorman
BOOST SOLENOID

Denso
AIR/FUEL SENSOR

Dorman
AIR CHECK VALVE

Dorman
THROTTLE BODY UNIT

WIX
AIR FILTER MIN ORDER QTY1
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