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
CRANKSHAFT SENSOR

Champion Race Plugs
PLATINUM POWER SPARK PLU
Dorman
RETAINER FITS 24MM HEX

Champion Race Plugs
IRIDIUM SPARK PLUGS BOX

Dorman
SPINDLE BOLT
Dorman
HOOD INSULATION

Dorman
WATER OUTLET

Hella
OILPRESSURE SWITCH

Hella
OIL PRESSURE SWITCH

Hella
CRANKSHAFT SENSOR

Dorman
TPMS VALVE CORE KIT

Bosch
CRANKSHAFT SENSOR

Bosch
RETAINING RING
Bosch
BEARING SLEEVE

Bosch
PROTECTIVE CAP

Hella
BULB 12V 29/8W W3X16Q S8
Bosch
BUSHING

Hella
SENDER UNIT INTAKE AIR TEMPERATURE

Hella
CRANK SHAFT PULSE SENSOR

Bosch
BRUSH HOLDER

Bosch
ROT.-SPEED SENSOR

Bosch
EL FIELD RHEOSTAT

Denso
CABIN AIR FILTER

Bosch
SPARK PLUG

Bosch
IGNITION COIL
Bosch
PARTS SET

Bosch
KNOCK SENSOR

NGK
NGK Laser Iridium Spark Plug Box of 4 (SILFER8C7ES)

Hella
Hella Bulb H1 12V 55W P14.5s T2.5 LONGLIFE

NGK
NGK Standard Spark Plug Box of 4 (BKUR6ET)

NGK
NGK Multi-Ground Spark Plug Box of 4 (PFR7W-TG)

NGK
NGK V-Power Spark Plug Box of 4 (BKR6E)

NGK
NGK Laser Platinum Spark Plug Box of 4 (PFR6U-11G)

NGK
NGK 2004-02 Audi A6 Quattro COP Pencil Type Ignition Coil

NGK
NGK Audi A4 1999-1997 Direct Ignition Coil Boot

NGK
NGK Double Platinum Spark Plug for Audi/VW Box of 4 (PFR6Q)

NGK
NGK Iridium Spark Plug Box of 4 (IFR6Q-G)

NGK
NGK Copper Core Spark Plug Box of 4 (BKUR6ET-10)

NGK
NGK Nickel Spark Plug Box of 4 (BKR6EKUB)

034Motorsport
HARNESS,1.8T COIL REPAIR
034Motorsport
D+TUNE, 2.0T Simos 18.4, Stg2
034Motorsport
D+TUNE, 2.0T Simos 18.4, Stg1

034Motorsport
D+TUNE, 2.0 TFSI B8 ST1
034Motorsport
D+TUNE, EA113HO 20T FSI LO420
034Motorsport
D+TUNE, B9 A4/A5 DL382 Stage 1
034Motorsport
D+TUNE, B7 A4 2.0T FSI, K04
034Motorsport
D+TUNE, EA113 LONG 20T FSI ST1
034Motorsport
D+TUNE, 2.0T B9 Q5, Stg2

Putco
Putco Plug and Play Load Resistor System - Fits 3157

Firstech
IDATASTART REMOTE START THARNESS FOR SELECT AUDI PORSCHE & VOLKSWAGEN MODELS 0

STANDARD IGN
MODULE

STANDARD IGN
ACCELERATOR PEDAL SENSOR

STANDARD IGN
INTERMOTOR CLOCK SPRING
STANDARD IGN
VACUUM PUMP

STANDARD IGN
ENGINE OIL LEVEL SENSOR CONNECTOR
REMY
REMANUFACTURED ALTERNATOR
REMY
REMANUFACTURED ALTERNATOR
REMY
IMPORT ALTERNATOR
REMY
REMANUFACTURED ALTERNATOR

REMY
REMANUFACTURED STARTER
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