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.
REMY
REMANUFACTURED ALTERNATOR

REMY
REMANUFACTURED ALTERNATOR
REMY
REMANUFACTURED ALTERNATOR

REMY
REMANUFACTURED STARTER

STANDARD IGN
LOCKS - IGNITION

REMY
IMPORT ALTERNATOR

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REMANUFACTURED ALTERNATOR

REMY
REMANUFACTURED ALTERNATOR

STANDARD IGN
VACUUM PUMP
STANDARD IGN
HAZARD WARNING SWITCH

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REMANUFACTURED STARTER
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NEW ALTERNATOR

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IMPORT STARTER

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IMPORT ALTERNATOR

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REMANUFACTURED STARTER
VALEO
LED FOG LIGHT BAR KIT

STANDARD IGN
LOCKS - IGNITION
REMY
IMPORT STARTER
EXIDE
EXIDE SPRINTER MAX EXTREME

DAYCO HYDRAULIC
OAP/OAD
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REMANUFACTURED ALTERNATOR
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REMANUFACTURED ALTERNATOR

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REMANUFACTURED ALTERNATOR

STANDARD IGN
VEHICLE SPEED SENSOR
STANDARD IGN
ABS WHEEL SPEED SENSOR WIRE HARNESS
STANDARD IGN
ABS SENSOR HARNESS
MOTORAD
KNOCK SENSOR
REMY
REMANUFACTURED ALTERNATOR
REMY
REMANUFACTURED ALTERNATOR

TRAKMOTIVE
NEW CV AXLE

STANDARD IGN
INTRMTR VOLTAGE REGULATOR

STANDARD IGN
INTRMTR VOLTAGE REGULATOR

STANDARD IGN
LOCKS - IGNITION

STANDARD IGN
AUDI A4, A6 2.8L ACK 05-9
STANDARD IGN
ABS SENSOR HARNESS
STANDARD IGN
CLOCK SPRING
STANDARD IGN
ACCELERATOR PEDAL SENSOR
STANDARD IGN
NEUTRAL/BACKUP SWITCH -02
A1 REMFG INC
IMPORT ECC
A1 REMFG INC
IMPORT ECC

TYC
STARTER MOTOR VW PASSAT 1.8L L4 0405

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STARTER MOTOR VW PASSAT 2.8L V6 0005

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1823 AD Q5/SQ5 L4 2.0 TUR STARTER

A1 REMFG INC
IMPORT ECC
A1 REMFG INC
VOLKSWAGEN PASSAT 01-00

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0509 AD A.4 / A.4 QATRO 3.2L V6 STR
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9904 VW PASAT 2.8L (Opt;120A)(6S) ALT

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ALTERNATOR AUDI A4 2.0L 0509

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ALTERNATOR AUDI A4 L4 2.0L 1316

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STARTER MOTOR AUDI A4 2.0L L4 0916
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1720 AD A.4/S.4 SDN L4 2.0T (6SC) ALTERNATOR

Metra Electronics
AUDI Q3 (TYP 8U) (W/CONCERT RADIO)

Jet Performance Products
JET XCELERATOR
Jet Performance Products
~(1 lbs. 7X7X2)~ V-Force Plus

Metra Electronics
NON-AMPLIFIED AND AMPLIFIED DATA IN

Metra Electronics
AUDI HDMI AND CAMERA INTERFACE 2013
East Penn Manufacturing
WIRE PRIMARY 16 GA 4000

Dorman
HID BALLAST
Dorman
HID CONTROL MODULE

Champion Race Plugs
CHAMPION IRIDIUM
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