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Audi S4 Most Popular Parts

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Front Big Brake Upgrade Kit - Stage 4 - 2-Piece Rotors (380x34)

ES#3221135 - 003883ecs01ktKT4 - Front Big Brake Upgrade Kit - Stage 4 - 2-Piece Rotors (380x34) - Everything necessary to upgrade your stage-3 RS caliper 365mm kit to the stage-4 380mm kit. - ECS - Audi

Everything necessary to upgrade your stage-3 RS caliper 365mm kit to the stage-4 380mm kit. 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
For customers with existing 365mm ECS Stage 3 Brake Kit with Audi RS5 Calipers

Brand:
ECS - Corporate Logo
ES#:
3221135
Mfg#:
003883ECS01KTKT4
Ships on Mar 10, 2027
ON SALE!
$1676.99

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

$1626.68 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Upper Guide Rail - Priced Each

ES#284640 - 079109470 - Upper Guide Rail - Priced Each - Upper rail that the left & right timing chains ride - Genuine Volkswagen Audi - Audi

Upper rail that the left & right timing chains ride 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:
Genuine Volkswagen Audi - Corporate Logo
ES#:
284640
Mfg#:
079109470
In Stock
6% off MSRP

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

$15.99

This product was last offered at the strikethrough price on
10-28-2026

$14.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Billet Linkage Stabilizer Rod Upgrade

ES#4840220 - B8033A0 - Billet Linkage Stabilizer Rod Upgrade - Replaces failure-prone stock anchor rod - JXB Performance - Audi

Replaces failure-prone stock anchor rod 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:
JXB Performance - Corporate Logo
ES#:
4840220
Mfg#:
B8033A0
In Stock at Vendor
$249.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Wheel Bearing

ES#4826859 - 8W0407625G - Wheel Bearing - Fits the left and right side. - Hudson - Audi

Fits the left and right side. 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:
Hudson - Corporate Logo
ES#:
4826859
Mfg#:
8W0407625G
Ships in 1 day
$129.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

JHM Solid Short Throw Shifter (Early Style)

ES#4046136 - STS-B5S4E - JHM Solid Short Throw Shifter (Early Style) - If you desire the ultimate in shifting, the JH Motorsports B5 S4, C5 A6-allroad and B5 Passat Early Style Solid Short Throw Shifter is the perfect solution! - JH Motorsports - Audi

If you desire the ultimate in shifting, the JH Motorsports B5 S4, C5 A6-allroad and B5 Passat Early Style Solid Short Throw Shifter is the perfect solution! 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
*For early style shifters - Please see shifter comparison links in product description*

Brand:
JH Motorsports - Corporate Logo
ES#:
4046136
Mfg#:
STS-B5S4E
In Stock
$294.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

DRA Series Wheel Spacers - 20mm (1 Pair)

ES#12121 - 40556654 - DRA Series Wheel Spacers - 20mm (1 Pair) - Add some stance to your vehicle with new spacers - H&R - Audi Mercedes Benz Porsche

Add some stance to your vehicle with new spacers 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:
H&R - Corporate Logo
ES#:
12121
Mfg#:
40556654
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.

$199.99

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

$179.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

B8 Performance Plus Front Strut - Priced Each

ES#4390623 - 24-274876 - B8 Performance Plus Front Strut - Priced Each - Compliments factory sport package or lowering springs with a remarkably comfortable sport ride. World-famous Bilstein quality with a limited lifetime warranty! - Bilstein - Audi

Compliments factory sport package or lowering springs with a remarkably comfortable sport ride. World-famous Bilstein quality with a limited lifetime warranty! 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:
Bilstein - Corporate Logo
ES#:
4390623
Mfg#:
24-274876
Ships on Jan 28, 2027
33% off MSRP

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

$370.00

This product was last offered at the strikethrough price on
10-28-2026

$249.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Supertech Inconel Exhaust Valve - 1.8T/2.7T - Priced Each

ES#3647472 - ST-AEVI-1103 - Supertech Inconel Exhaust Valve - 1.8T/2.7T - Priced Each - Standard sized valve head diameter, factory triple groove keeper setup - Supertech - Audi Volkswagen

Standard sized valve head diameter, factory triple groove keeper setup 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
*Valves priced individually - For 1.8T - qty 8 needed / For 2.7T - qty 12 needed - Please see long description for additional valve seal/keeper informati

Brand:
Supertech - Corporate Logo
ES#:
3647472
Mfg#:
ST-AEVI-1103
In Stock
$44.78 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Purge Valve

ES#3447 - 1C0906517A - Purge Valve - Common cure for DTC P0441 - Bosch - Audi Volkswagen Porsche

Common cure for DTC P0441 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:
Bosch - Corporate Logo
ES#:
3447
Mfg#:
1C0906517A
In Stock
$69.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

18" RSe10 - Set Of Four

ES#4447260 - 88.10.17bgKT - 18" RSe10 - Set Of Four - 18"x8.5" ET45 5x112 - Gloss Black - Neuspeed - Audi Volkswagen

18"x8.5" ET45 5x112 - Gloss Black 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:
Neuspeed - Corporate Logo
ES#:
4447260
Mfg#:
88.10.17BGKT
Ships on Dec 1, 2026
$1608.99 USD
This product is lifetime replacement eligible Lifetime Replacement

RS4 K04 Turbochargers With Install Kit

ES#3247798 - 5304988002526KT - RS4 K04 Turbochargers With Install Kit - Includes the left (K04-025) & right (K04-026) side turbochargers with associated installation hardware - Assembled By ECS - Audi

Includes the left (K04-025) & right (K04-026) side turbochargers with associated installation hardware 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
Does NOT include the RS4 or modified intake pipes necessary for a complete install - For a bolt-on solution, please see 034Motorsport's inlet pipe kit 034-145-P002 (ES2864575).

Brand:
Assembled By ECS - Corporate Logo
ES#:
3247798
Mfg#:
5304988002526KT
Ships in 1-3 days
$3214.00

This product was last offered at the strikethrough price on
06-19-2026

$3211.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Stage 3 Endurance Clutch Kit

ES#3106550 - ks4b8sstzKT - Stage 3 Endurance Clutch Kit - Designed for dedicated track cars. Conservatively rated at 650ft/lbs. - South Bend Clutch - Audi

Designed for dedicated track cars. Conservatively rated at 650ft/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

Brand:
South Bend Clutch - Corporate Logo
ES#:
3106550
Mfg#:
KS4B8SSTZKT
Ships on Nov 16, 2026
$3210.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Flywheel Bolt - Priced Each

ES#2088466 - N91143203 - Flywheel Bolt - Priced Each - Secures the flywheel to crankshaft. M10X1X15.5 - Genuine Volkswagen Audi - Audi

Secures the flywheel to crankshaft. M10X1X15.5 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:
Genuine Volkswagen Audi - Corporate Logo
ES#:
2088466
Mfg#:
N91143203
In Stock
$5.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Audi B9 S4 Pre-facelift Rear Diffuser & Trunk Spoiler

ES#4751275 - 028801ECS01EBKT - Audi B9 S4 Pre-facelift Rear Diffuser & Trunk Spoiler - Add some aggressive styling to your Audi! - Enthusiast Bundles - Audi

Add some aggressive styling to your Audi! Don't See A Bundle You Want - Give Us A Call Or Chat - We Will Make One! 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 pre-facelift models (up to 2019) without integrated tips in the rear valance

Brand:
Enthusiast Bundles - Corporate Logo
ES#:
4751275
Mfg#:
028801ECS01EBKT
In Stock
ON SALE! SAVE 34%
$696.26

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

$458.51 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Lightweight Flywheel, 112621

ES#7820 - B5S4FLWF - Lightweight Flywheel, 112621 - Fidanza - Audi

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
*For use with Audi B7 RS4 Clutch Kit - ES2538757*

Brand:
Fidanza - Corporate Logo
ES#:
7820
Mfg#:
B5S4FLWF
Back Ordered
$640.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Accessory Belt/Serpentine Belt Kit W/ Tensioners

ES#4699489 - 06m260849lKT - Accessory Belt/Serpentine Belt Kit W/ Tensioners - Keep your car from breaking down by replacing your cracked drive belt - Genuine Volkswagen Audi - Audi

Keep your car from breaking down by replacing your cracked drive belt 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:
Genuine Volkswagen Audi - Corporate Logo
ES#:
4699489
Mfg#:
06M260849LKT
Ships in 1 day
$824.99

This product was last offered at the strikethrough price on
07-07-2026

$799.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

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