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Audi S4 Most Popular Parts

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19" BBS CC-R Wheels - Set Of Four

19x8.5 ET40 5x112 57.1CB - Satin Platinum with a Polished Outer Lip Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply

Brand:
BBS - Corporate Logo
ES#:
4753449
Mfg#:
CC2104PPOKT
Ships on Nov 13, 2026
$3393.00 USD
This product is lifetime replacement eligible Lifetime Replacement

Wheel Spacer & Bolt Kit - 17.5mm With Black Conical Seat Bolts

ES#2748289 - 6-ECS-023 - Wheel Spacer & Bolt Kit - 17.5mm With Black Conical Seat Bolts - Complete kit for two wheels, comes with everything you need to install spacers on your aftermarket wheels - ECS - Audi

Complete kit for two wheels, comes with everything you need to install spacers on your aftermarket wheels 10X Entries Into Our F80 M3 Sweepstakes Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply
Fits most aftermarket wheels that use conical seat wheel bolts

Brand:
ECS - Corporate Logo
ES#:
2748289
Mfg#:
6-ECS-023
In Stock
ON SALE! SAVE 25%
$173.99

This product was last offered at the strikethrough price on
06-13-2026

$130.49 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Limited Slip Differential

ES#2836902 - 40309175WK - Limited Slip Differential - Put all your power to the ground! - Wavetrac - Audi Porsche

Put all your power to the ground! Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply
Fits 0A3 manual transmission models only

Brand:
Wavetrac - Corporate Logo
ES#:
2836902
Mfg#:
40309175WK
Ships in 2 Business Days
$1695.00 USD
Free Shipping

JHM Exhaust Headers With Cats

For Manual Transmissions - Comes with cats and 2.5" cat back Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply

Brand:
JH Motorsports - Corporate Logo
ES#:
5376133
Mfg#:
JHM-B6S-LTHM
Ships in 10 Business Days
$3386.99 USD
Free Shipping
on orders $49 and up

Stage 2 Daily Clutch Kit

ES#3106516 - k70398fhdoKT - Stage 2 Daily Clutch Kit - Designed for the daily-driven, weekend track warrior. Conservatively rated at 350ft/lbs. - South Bend Clutch - Audi

Designed for the daily-driven, weekend track warrior. Conservatively rated at 350ft/lbs. Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply
Includes single mass flywheel

Brand:
South Bend Clutch - Corporate Logo
ES#:
3106516
Mfg#:
K70398FHDOKT
In Stock
$1692.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Motorsport StreetSport Engine Mounts - Pair

ES#4846368 - 034-509-0089 - Motorsport StreetSport Engine Mounts - Pair - Designed with extreme performance in mind and manufactured from billet aluminum and high-durometer Density Line rubber for better ride characteristics than polyurethane. - 034Motorsport - Audi

Designed with extreme performance in mind and manufactured from billet aluminum and high-durometer Density Line rubber for better ride characteristics than polyurethane. 2X Entries Into Our F80 M3 Sweepstakes Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply

Brand:
034Motorsport - Corporate Logo
ES#:
4846368
Mfg#:
034-509-0089
In Stock
$677.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Street Performance Coilover Kit

ES#628 - 29471-1 - Street Performance Coilover Kit - Unrivaled comfort and performance. Average lowering of 1.6"-2.5"F 1.3"-2.0"R - H&R - Audi

Unrivaled comfort and performance. Average lowering of 1.6"-2.5"F 1.3"-2.0"R Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply
We Price Match - Give Us A Call or Chat!
Fits Sedan models only

Brand:
H&R - Corporate Logo
ES#:
628
Mfg#:
29471-1
In Stock
10% off MSRP

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$1880.00

This product was last offered at the strikethrough price on
10-01-2026

$1692.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Ultra Low Coilover System - Fixed Damping

ES#2718824 - 29019-1 - Ultra Low Coilover System - Fixed Damping - Extreme lowering capabilities - Average lowering of 1.5"-2.7"F 1.4"-2.7"R - H&R - Audi

Extreme lowering capabilities - Average lowering of 1.5"-2.7"F 1.4"-2.7"R Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply
We Price Match - Give Us A Call or Chat!
Vehicles equipped with Electronic Damping Control (EDC) will lose shock damping and receive a system error code with coilover systems.

Brand:
H&R - Corporate Logo
ES#:
2718824
Mfg#:
29019-1
Ships in 3 Business Days
10% off MSRP

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$1880.00

This product was last offered at the strikethrough price on
10-01-2026

$1692.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Front Brake Rotors - Pair (321x30)

ES#2500642 - 8E0615301AD - Front Brake Rotors - Pair (321x30) - With "Coat Z" Anti-Corrision coating - Zimmermann - Audi

With "Coat Z" Anti-Corrision coating Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply
We Price Match - Give Us A Call or Chat!

Brand:
Zimmermann - Corporate Logo
ES#:
2500642
Mfg#:
8E0615301AD
In Stock
$187.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Timing Belt Kit - Ultimate With Gates Racing Timing Belt & Cam Locking Tool

ES#2777125 - 078198671kt - Timing Belt Kit - Ultimate With Gates Racing Timing Belt & Cam Locking Tool - Complete kit to service your timing belt, water pump, and thermostat - Assembled By ECS - Audi

Complete kit to service your timing belt, water pump, and thermostat 10X Entries Into Our F80 M3 Sweepstakes Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply

Brand:
Assembled By ECS - Corporate Logo
ES#:
2777125
Mfg#:
078198671KT
Ships in 10 Business Days
ON SALE!
$619.99

This product was last offered at the strikethrough price on
05-02-2026

$563.14 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Cat-Back Exhaust System - Resonated With Exhaust Valves

ES#3240918 - SSXAU641 - Cat-Back Exhaust System - Resonated With Exhaust Valves - 2.50" stainless steel with quad GT-100 Cerakote black tips - Milltek Sport - Audi

2.50" stainless steel with quad GT-100 Cerakote black tips Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply
Fits models without factory rear sports differential
For vehicles without a sport differential

Brand:
Milltek Sport - Corporate Logo
ES#:
3240918
Mfg#:
SSXAU641
Ships on Nov 18, 2026
ON SALE! SAVE 10%
$3752.99

This product was last offered at the strikethrough price on
08-17-2026

$3377.24 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Cat-Back Exhaust - Resonated

2.50" stainless steel with your choice of tip style Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply

Brand:
Milltek Sport - Corporate Logo
ES#:
4164540
Mfg#:
B9RESONATED
Ships on Nov 18, 2026
ON SALE!
Starting at $3116.70 USD
Customize
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Mass Air Flow Sensor (MAF)

ES#252386 - 077133471K - Mass Air Flow Sensor (MAF) - Restore fuel economy and performance - Bosch - Audi

Restore fuel economy and performance Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply
We Price Match - Give Us A Call or Chat!
OEM RS4, larger diameter housing than Stock S4 allows increased air flow on high boosted engines

Brand:
Bosch - Corporate Logo
ES#:
252386
Mfg#:
077133471K
Ships in 1 Business Day
$218.99

This product was last offered at the strikethrough price on
10-14-2026

$210.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

premium Oil Service Kit

ES#2817110 - 2332KT5 - premium Oil Service Kit - Includes Mann oil filter and Liqui-Moly High Tech 5w-40 oil - Assembled By ECS - Audi

Includes Mann oil filter and Liqui-Moly High Tech 5w-40 oil 10X Entries Into Our F80 M3 Sweepstakes Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply

Brand:
Assembled By ECS - Corporate Logo
ES#:
2817110
Mfg#:
2332KT5
In Stock
ON SALE!
$120.99

This product was last offered at the strikethrough price on
08-31-2026

$111.02 USD
Free Shipping
This product is lifetime replacement eligible Partial Replacement

Front Axle Assembly - Right

ES#3072343 - 8E0407272AT - Front Axle Assembly - Right - Complete driveshaft with CV joints; ready for installation - GKN Drivetech - Audi

Complete driveshaft with CV joints; ready for installation Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply

Brand:
GKN Drivetech - Corporate Logo
ES#:
3072343
Mfg#:
8E0407272AT
Ships in 3 Business Days
$628.99

This product was last offered at the strikethrough price on
09-30-2026

$373.52 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Conical Seat Tuner Spline Bolt Set - Standard Length - Black

ES#3246217 - TunerBoltKit1 - Conical Seat Tuner Spline Bolt Set - Standard Length - Black - Full set of black tuner style, socket-specific lug bolts. 14x1.5x27mm - Rohana Wheels - Audi BMW Volkswagen

Full set of black tuner style, socket-specific lug bolts. 14x1.5x27mm Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply

Brand:
Rohana Wheels - Corporate Logo
ES#:
3246217
Mfg#:
TUNERBOLTKIT1
Back Ordered
$70.00 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

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