QUATTRO MEETS PRACTICALITY

B5 through B9 — Audi's compact sedan with available Quattro AWD and turbo power.

Audi A4 HERITAGE

THE QUATTRO COMPACT

The Audi A4 has been the German compact sport sedan since 1994. The B5 (1.8T) launched the tuner-friendly chassis, the B6/B7 added the K04 turbo upgrade culture, and the B8/B9 brought EA888 turbocharged 2.0T engines that share parts with the VW Golf R / Jetta GLI.

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

3,135
Parts that fit
3,000+
MOTORMIA Builds
EBC
#1 brand by SKUs
$711
Average MSRP

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.

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30-Day Returns
R

REMY

REMANUFACTURED ALTERNATOR

REMANUFACTURED ALTERNATOR

REMY

REMANUFACTURED ALTERNATOR

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REMY

REMANUFACTURED ALTERNATOR

REMANUFACTURED STARTER

REMY

REMANUFACTURED STARTER

LOCKS - IGNITION

STANDARD IGN

LOCKS - IGNITION

IMPORT ALTERNATOR

REMY

IMPORT ALTERNATOR

REMANUFACTURED ALTERNATOR

REMY

REMANUFACTURED ALTERNATOR

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VACUUM PUMP

STANDARD IGN

VACUUM PUMP

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STANDARD IGN

HAZARD WARNING SWITCH

REMY red auto part

REMY

REMANUFACTURED STARTER

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REMY

NEW ALTERNATOR

REMY auto part

REMY

IMPORT STARTER

REMY auto part

REMY

IMPORT ALTERNATOR

REMY red auto part

REMY

REMANUFACTURED STARTER

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VALEO

LED FOG LIGHT BAR KIT

STANDARD IGN auto part

STANDARD IGN

LOCKS - IGNITION

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REMY

IMPORT STARTER

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EXIDE

EXIDE SPRINTER MAX EXTREME

DAYCO HYDRAULIC auto part

DAYCO HYDRAULIC

OAP/OAD

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REMANUFACTURED ALTERNATOR

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REMY red auto part

REMY

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STANDARD IGN auto part

STANDARD IGN

VEHICLE SPEED SENSOR

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STANDARD IGN

ABS WHEEL SPEED SENSOR WIRE HARNESS

S

STANDARD IGN

ABS SENSOR HARNESS

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MOTORAD

KNOCK SENSOR

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REMY

REMANUFACTURED ALTERNATOR

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REMY

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TRAKMOTIVE auto part

TRAKMOTIVE

NEW CV AXLE

STANDARD IGN auto part

STANDARD IGN

INTRMTR VOLTAGE REGULATOR

STANDARD IGN auto part

STANDARD IGN

INTRMTR VOLTAGE REGULATOR

STANDARD IGN auto part

STANDARD IGN

LOCKS - IGNITION

STANDARD IGN auto part

STANDARD IGN

AUDI A4, A6 2.8L ACK 05-9

S

STANDARD IGN

ABS SENSOR HARNESS

S

STANDARD IGN

CLOCK SPRING

S

STANDARD IGN

ACCELERATOR PEDAL SENSOR

S

STANDARD IGN

NEUTRAL/BACKUP SWITCH -02

A

A1 REMFG INC

IMPORT ECC

A

A1 REMFG INC

IMPORT ECC

TYC auto part

TYC

STARTER MOTOR VW PASSAT 1.8L L4 0405

TYC auto part

TYC

STARTER MOTOR VW PASSAT 2.8L V6 0005

TYC auto part

TYC

1823 AD Q5/SQ5 L4 2.0 TUR STARTER

A1 REMFG INC auto part

A1 REMFG INC

IMPORT ECC

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A1 REMFG INC

VOLKSWAGEN PASSAT 01-00

0509 AD A.4 / A.4 QATRO 3.2L V6 STR

TYC

0509 AD A.4 / A.4 QATRO 3.2L V6 STR

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TYC

9904 VW PASAT 2.8L (Opt;120A)(6S) ALT

TYC auto part

TYC

ALTERNATOR AUDI A4 2.0L 0509

TYC auto part

TYC

ALTERNATOR AUDI A4 L4 2.0L 1316

STARTER MOTOR AUDI A4 2.0L L4 0916

TYC

STARTER MOTOR AUDI A4 2.0L L4 0916

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TYC

1720 AD A.4/S.4 SDN L4 2.0T (6SC) ALTERNATOR

Metra Electronics auto part

Metra Electronics

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

Jet Performance Products auto part

Jet Performance Products

JET XCELERATOR

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Jet Performance Products

~(1 lbs. 7X7X2)~ V-Force Plus

NON-AMPLIFIED AND AMPLIFIED DATA IN

Metra Electronics

NON-AMPLIFIED AND AMPLIFIED DATA IN

Metra Electronics auto part

Metra Electronics

AUDI HDMI AND CAMERA INTERFACE 2013

E

East Penn Manufacturing

WIRE PRIMARY 16 GA 4000

Dorman auto part

Dorman

HID BALLAST

D

Dorman

HID CONTROL MODULE

Champion Race Plugs auto part

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