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.

Gates
Gates 09-16 Audi A4 4-Cyl. 2.0L PCV Valve To Tube Emission Control Hose

APR Tuning
Carbon Fiber Intake 2.0T A4/A5 (B9) Fits Audi A4 17-18, A4 allroad 17-24, A4 Quattro 17-24, A5 Quattro 18-24, A5 Sportback 18-24 APR

Wagner Tuning
Wagner Tuning 17-25 Audi A4 B9 3.0TDI Competition Intercooler Kit

APR Tuning
PEX Intake B9 2.0T Fits 2017-2018 Audi A4 2017-2024 Audi A4 Allroad/A5 Quattro/A5 Sportback APR

APR Tuning
OEM Fuel Injectors 4 Bosch HDEV 1 2.0T EA113 High Flow Fits Audi A3 06-13, A3 Quattro 09-13, A4 05-08, A4 Quattro 05-08, TT 08-09, TT Quattro 09-15, TTS Quattro 09-15, VW Eos 07-16, Golf R 12-13, GTI 06-09, Jetta 05-10, Passat 06-10 APR

APR Tuning
K04-64 Turbo System 2.0T Transverse EA113 Fits Audi A3 06-13, A3 Quattro 09-13, A4 05-08, A4 Quattro 05-08, TT 08-09, TT Quattro 09-15, TTS Quattro 09-15 Volkswagen Eos 07-16, Golf R 12-13, GTI 06-09, Jetta 05-10, Passat 06-10 APR

APR Tuning
K04-64 Turbo System 2.0T Transverse EA113 (No Software) Fits Audi A3 06-13, A3 Quattro 09-13, TT 08-09, TT Quattro 09-15 Volkswagen Eos 07-16, GTI 06-09, Jetta 06-10, Passat 06-10 APR

APR Tuning
K04-64 Turbo System B7/B8/B8.5 Longitudinal 2.0T Fits 2005-2016 Audi A4/A4 Quattro 2010-2014 Audi A5 2010-2017 Audi A5 Quattro 2013-2016 Audi Allroad 2011-2017 Audi Q5 APR

APR Tuning
K04-15 Turbo System 1.8T Longitudinal B6 A4 w/o Injectors Fits Audi A4 02-06, A4 Quattro 02-05 APR

APR Tuning
Carbon Fiber Intake B8 4-Cylinder Fits 2013-2016 Audi Allroad 2010-2017 A5 Quattro 2011-2017 Q5 2010-2014 A5 2009-2016 A4 and A4 Quattro APR

APR Tuning
MQB TURBO MUFFLER DELETE
BorgWarner
BorgWarner Turbocharger SX K03 Audi/VW 2.0 TFSI Upgrade

Remus
Remus Throttle Responder
Wagner Tuning
Wagner Tuning Audi A4 2.0L TFSI Competition Intercooler Kit
Injector Dynamics
Injector Dynamics USCAR to EV1 PnP Adapter

BorgWarner
BorgWarner Turbocharger KO3 Replacement
Wagner Tuning
Wagner Tuning Audi A4/A5 2,0 TFSI Competition Intercooler Kit

BMC
BMC 95-00 Audi A4 I Series 1.8 Carbon Dynamic Airbox Kit

Victor Reinz
MAHLE Original Audi A4 08-06 Plenum Chamber
Injector Dynamics
Injector Dynamics 2600-XDS Injectors - 60mm Length - 14mm Top - 14mm Bottom Adapter (Set of 4)

BorgWarner
BorgWarner K04 Cartridge Assembly for- 5304 988 0064 / 5304 988 0191
BorgWarner
BorgWarner K-Series K04 Turbocharger - Replaces bwa53049880015

Injector Dynamics
Injector Dynamics Denso EV1 PnP Adapter

BorgWarner
BorgWarner Turbocharger SX K04 Audi/VW 1.8L 5V TFSI Upgrade

Victor Reinz
MAHLE Original Audi A3 08-06 Fuel Pump Gasket
Wagner Tuning
Wagner Tuning Audi A4/RS4 B5 Competition EVO2 Intercooler Kit w/Carbon Air Shroud

Wagner Tuning
Wagner Tuning Audi A4/RS4 B5 Competition EVO II Intercooler Kit w/o Carbon Air Shroud
BorgWarner
BorgWarner Turbocharger SX K03 00-05 Audi/VW 1.8T Upgrade

NGK
NGK Audi A6 2011-2010 Direct Fit 5-Wire Wideband A/F Sensor

Injen
Injen 10-19 Audi A4 2.0T / 06-19 VW GTI 2.0T / 12-19 VW Golf R 2.0T X-Pedal Pro Black Edition Thrott

Wagner Tuning
Wagner Tuning BMW 2-Series F22/F23 Twin Disc Clutch Kit

Radium Engineering
Radium Engineering VW/Audi EA888 Fuel Rail / Port Injection

Go Fast Bits
GFB VTA Blow Off Valve Early VW/Audi TSI/TFSI Engines w/Pierburg Diverter Valve

Go Fast Bits
GFB Polaris RZR Turbo SXV Recirculating Bypass Valve

Wilwood
Wilwood 08-12 Audi A4 Front Kit A5 S5 AERO6

Injector Dynamics
Injector Dynamics 1340cc Injectors - 60mm Length - 14mm Purple Top - 14mm Lower O-Ring (Set of 4)

Bosch
Bosch 96-99 Volkswagen Jetta Mass Air Flow Sensor

Mishimoto
Mishimoto 06-08 VW/Audi Ignition Coil

Wagner Tuning
Wagner Tuning Audi A4 B9 2.0TFSI Competition Intercooler Kit

Bosch
Bosch Manifold Absolute Pressure Sensor (OE 038906051C/03G906051E/03G906051M)

Victor Reinz
MAHLE Original Audi A4 01-97 Injector O-Ring Kit
Victor Reinz
MAHLE Original Audi A4 Allroad 14-13 Throttle Body Gasket

Injector Dynamics
Injector Dynamics ID1050X Injectors 14mm (Purple) Top (Set of 4)

Victor Reinz
MAHLE Original Fuel Injector O-Ring Kit

AWE Tuning
AWE Tuning Audi S-FLO Carbon Intake for B8 3.0T / 3.2L

Wagner Tuning
Wagner Tuning Audi A4/A5 B8 2.0L TFSI Competition Intercooler Kit

Grams Performance
Grams Performance Chevy Cobalt 1000cc Fuel Injectors (Set of 4)

Grams Performance
Grams Performance 1600cc 1.8T/ 2.0T INJECTOR KIT

Victor Reinz
MAHLE Original Audi A4 05-97 Throttle Body Gasket

Grams Performance
Grams Performance Chevy Cobalt 750cc Fuel Injectors (Set of 4)

Grams Performance
Grams Performance Chevy Cobalt 550cc Fuel Injectors (Set of 4)

AWE Tuning
AWE Tuning Audi 3.0T S-FLO Carbon Cover

AWE Tuning
AWE Tuning B8 3.0T S-FLO Filter

Victor Reinz
MAHLE Original Audi A3 13-06 Throttle Body Gasket

AWE Tuning
AWE Tuning Audi B9/B9.5 S4/S5/RS5 3.0T Carbon Fiber AirGate Intake w/ Lid

Grams Performance
Grams Performance 1150cc 1.8T/ 2.0T INJECTOR KIT

Grams Performance
Grams Performance 04-16 Audi A4 B7/B8 2.0T 70mm DBW Throttle Body - Black

AWE Tuning
AWE Tuning Audi B9 A4/A5 2.0T Quattro Carbon Fiber AirGate Intake w/ Lid

AWE Tuning
AWE Tuning Audi S-FLO Intake for B8 3.0T / 3.2L

AWE Tuning
AWE Tuning 2018-2019 Audi B9 S4 / S5 Quattro 3.0T Cold Front Intercooler Kit
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