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.

Victor Reinz
MAHLE Original Audi A3 13-06 Intake Manifold Gasket

Victor Reinz
MAHLE Original Audi A4 08-06 Throttle Body Gasket

Victor Reinz
MAHLE Original Audi A4 03-97 Throttle Body Gasket

Go Fast Bits
Pulley Kit Lightweight Underdrive 300ZX

Turbosmart
Turbosmart 15-21 Volkswagen GTI/Golf R MK7 BOV Kompact EM Dual Port

Go Fast Bits
GFB 02-10 WRX/STI 2 Piece Under-Drive Pulley Kit w/ Belts (Crank & Alternator)

DeatschWerks
DeatschWerks 01-06 Audi A4/TT / VW Golf GTI 650cc Injectors

Nitrous Express
Nitrous Express - ALL SPORT COMPACT EFI SINGLE NOZZLE SYSTEM (35-50-75 HP) WITH 5LB BOTTLE - 20923-05

DeatschWerks
DeatschWerks 01-06 Audi A4/TT / VW Golf GTI 440cc Injectors

Nitrous Express
Nitrous Express - SPORT COMPACT EFI DUAL STAGE (35-75) X 2 WITH 15LB BOTTLE - 20927-15

K&N Engineering
K&N 16-18 Audi A5 L4-2.0L Diesel Engine Replacement Air Filter

aFe
aFe MagnumFORCE Intakes Stage-2 PDS AIS PDS Audi A4 02-05 L4-1.8L (t)

Go Fast Bits
GFB Diverter Valve ATMO DV+ 2.0T FSI & TSI VAG Applications (Direct Replacement)

DeatschWerks
DeatschWerks 01-06 Audi A4/TT / 00-06 Volkswagen Golf GTI Bosch EV14 1500cc Injectors (Set of 4)

Nitrous Express
Nitrous Express - ALL SPORT COMPACT EFI SINGLE NOZZLE SYSTEM (35-50-75 HP) LESS BOTTLE - 20923-00

Go Fast Bits
GFB Deceptor Pro II Blow Off Valve - 25mm Inlet/25mm Outlet

DeatschWerks
DeatschWerks 01-06 Audi A4/TT / VW Golf GTI 750cc Injectors

BD Diesel
BD DieselPower Throttle Sensitivity Booster v3.0 - VW / Audi / Porsche

CSF
CSF 05-09 Audi A4 2.0L OEM Intercooler

Go Fast Bits
GFB 13 Subaru BRZ / 13 Scion FR-S 3 Pc L/W Pulley Kit (Inc Crank/Alternator/Water Pump Pulleys)

K&N Engineering
K&N Audi A4 2.8L V6 Performance Intake Kit

Injen
Injen 17-19 Audi A4 2.0T Polished Cold Air Intake

Turbosmart
Turbosmart BOV Kompact Dual Port 2.0T VAG V2

Volant
Volant 09-13 Audi A4 2.0T / 11-13 A5 2.0T Powercore Closed Box Air Intake System

Go Fast Bits
GFB Audi/VW 1.8T TMS Respons Blow Off Valve Kit

K&N Engineering
K&N Audi A4 1.8L Turbo 150BHP Performance Intake Kit

Hella
Hella 02-15 Audi / Volkswagen Electric Vacuum Pump

CSF
CSF 05-09 Audi A4 2.0L OEM Intercooler

Turbosmart
Turbosmart Boost Reference Adapter 03+ VW Golf GTI MK5/6 2.0 TFSI - Black

Injen
Injen 17-19 Audi A4 2.0T Black Cold Air Intake

K&N Engineering
K&N 95+ Audi A4 1.8i T Performance Intake Kit

Snow Performance
Snow Performance Stg 3 Boost Cooler EFI 2D MAP Prog. Water Injection Kit (SS Braided Line & 4AN)

Turbosmart
Fuel Pressure Regulator - TS-0402-1006

K&N Engineering
K&N 09-10 Audi A4 2.0L Typhoon Air Intake

K&N Engineering
K&N 94-05 Audi / 01-08 Skoda / 96-05 VW Drop In Air Filter

Injen
Injen 09-16 Audi A4 2.0L (t) Polished Cold Air Intake

DeatschWerks
DeatschWerks 01-06 Audi A4/TT / 00-06 VW Golf GTI Bosch EV14 1200cc Injectors (Set of 4)

Nitrous Express
Nitrous Express - ALL SPORT COMPACT EFI SINGLE NOZZLE SYSTEM (35-50-75 HP) WITH 15LB BOTTLE - 20923-15

Go Fast Bits
GFB HYBRID TMS Dual Port 20mm Inlet/20mm Outlet 97-05 VW Golf GTI 1.8T

K&N Engineering
K&N Audi A4/A6 11.9 TDI 90BHP Performance Intake Kit

Nitrous Express
Nitrous Express - ALL SPORT COMPACT EFI SINGLE NOZZLE SYSTEM (35-50-75 HP) WITH 10LB BOTTLE - 20923-10

K&N Engineering
K&N 14-16 Audi A4 L4-2.0L DSL Drop In Air Filter

DeatschWerks
DeatschWerks 01-06 Audi A4/TT / VW Golf GTI 1000cc Injectors

Go Fast Bits
GFB Diverter Valve dv+ 2.0T VAG Applications (Direct Replacement)

Turbosmart
Turbosmart VW/Audi 2.0T VAG V2 BOV Kompact Plumb Back Kit

Go Fast Bits
GFB Diverter Valve DV+ Volkswagen TSI/TFSI w/Pierburg Diverter Valve

Go Fast Bits
GFB Mach 2 TMS Recirculating Diverter Valve - 25mm Inlet/25mm Outlet

K&N Engineering
K&N 15-18 Audi A4 L4-2.0 F/I Replacement Drop In Air Filter

NGK
NGK Audi A4 1997-1996 Direct Fit Oxygen Sensor

NGK
NGK Audi A4 Quattro 2009 Direct Fit Oxygen Sensor

NGK
NGK Audi TT 2001-2000 Direct Fit Oxygen Sensor

NGK
NGK Audi A6 2009-2006 Direct Fit Oxygen Sensor

NGK
NGK Audi A4 1999-1997 Direct Fit Oxygen Sensor

NGK
NGK OE Type 5-Wire Wideband A/F Sensor

NGK
NGK Audi A4 2009-2005 Direct Fit Oxygen Sensor

NGK
NGK Audi A4 2006-2000 Direct Fit Oxygen Sensor

NGK
NGK Audi A4 2001-2000 Direct Fit Oxygen Sensor

NGK
NGK Audi A3 2013-2011 Direct Fit Oxygen Sensor

NGK
NGK Audi A6 2011-2010 Direct Fit Oxygen Sensor

NGK
NGK Audi A3 2013-2010 Direct Fit 5-Wire Wideband A/F 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