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.

NGK
NGK Ruthenium HX Spark Plug Box of 4 (FR6AHX-S)

NGK
NGK Single Platinum Spark Plug Box of 4 (BKR6EGP)

NGK
NGK Ruthenium HX Spark Plug Box of 4 (FR6BHX-S)

NGK
NGK Laser Platinum Spark Plug Box of 4 (PLFER7A8EG)

NGK
NGK Iridium Spark Plug Box of 4 (BKR6EIX-11)

NGK
NGK Iridium Spark Plug Box of 4 (BKR6EIX)

NGK
NGK 2005-01 VW Passat COP Pencil Type Ignition Coil

NGK
NGK Ruthenium HX Spark Plug Box of 4 (LFER7BHX)

NGK
NGK Multi-Ground Spark Plug Box of 4 (BKR6EQUP)

aFe
aFe Scorcher GT Module 15-16 Audi A3 1.8/2.0T

aFe
aFe Scorcher GT Module 09-16 Audi A4 B8 2.0T

STANDARD IGN
AUDI RELAY

STANDARD IGN
CRANKSHAFT SENSOR

STANDARD IGN
MULTI FUNCTION CONNECTOR

STANDARD IGN
SPEED SENSOR

STANDARD IGN
SPEED SENSOR

STANDARD IGN
CRANKSHAFT SENSOR CONNECTOR

STANDARD IGN
CRANKSHAFT SENSOR

STANDARD IGN
SWITCH-OIL PR.

Walker Products Inc. - Sensors
IGNITION COIL

STANDARD IGN
HEADLAMP WIRING HARNESS

STANDARD IGN
SWITCH
STANDARD IGN
OIL PRESSURE SWITCH

Walker Products Inc. - Sensors
ENGINE CRANKSHAFT POSITION SENSOR

Walker Products Inc. - Sensors
ENGINE CAMSHAFT POSITION SENSOR

Walker Products Inc. - Sensors
IGNITION COIL

STANDARD IGN
INTRMTR COIL ON PLUG

STANDARD IGN
COIL

Walker Products Inc. - Sensors
IGNITION COIL

Walker Products Inc. - Sensors
ENGINE CRANKSHAFT POSITION SENSOR

STANDARD IGN
KNOCK SENSORS

STANDARD IGN
RELAY

Walker Products Inc. - Sensors
ENGINE CRANKSHAFT POSITION SENSOR

Walker Products Inc. - Sensors
ENGINE CAMSHAFT/CRANKSHAFT POSITION

MOTORAD
TETHERED FUEL CAP

MOTORAD
IGNITION COIL

MOTORAD
ENGINE CAMSHAFT POSITION SENSOR
STANDARD IGN
MULTI FUNCTION CONNECTOR

Walker Products Inc. - Sensors
ENGINE CAMSHAFT POSITION SENSOR

Walker Products Inc. - Sensors
IGNITION COIL

Walker Products Inc. - Sensors
IGNITION COIL

STANDARD IGN
COIL ON PLUG COIL

STANDARD IGN
INTRMTR SNSR-SPEED

STANDARD IGN
CAMSHAFT SENSOR CONNECTOR

STANDARD IGN
MULTI FUNCTION CONNECTOR

STANDARD IGN
CAMSHAFT SENSOR

DELPHI
CAMSHAFT POSITION SENSOR

STANDARD IGN
SPEED SENSOR

DELPHI
IGNITION COIL - PENCIL

DELPHI
IGNITION COIL - COIL ON PLUG
DELPHI
STABILIZER BAR LINK

Autolite
FLAT PACK SPARK PLUG - 48

Brisk Spark Plugs
Spark Plug Silver Racing

Brisk Spark Plugs
Spark Plug Silver Racing

Brisk Spark Plugs
Spark Plug Silver Racing

Metra Electronics
AD-ADXSVI AUDI CAN INTERFACE 2006-2013

Metra Electronics
AFTRMARKET ANTENNA TO VW CABLE

Metra Electronics
8805 AUDI/BMW/MERCEDES/VW FACTORY ANTENNA W/FLAT PLUG ANTENNA ADAPTER

Metra Electronics
AUDI A3 A4 1996-2001 SPEAKER ADAPTER - 6 TO 6 3/4IN

Metra Electronics
8805 AUDI/BMW/MERCEDES/VW FACTORY RADIO W/FLAT CONNECTOR TO AFTERMARKET ANTENNA
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