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Audi S4 Performance Parts & Upgrades

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Audi B8/8.5 S4 Valved Exhaust System - Resonated With 4" Chrome Swivel Tips

ES#3619908 - 008553ecs01KT - Audi B8/8.5 S4 Valved Exhaust System - Resonated With 4" Chrome Swivel Tips - ECS evolutionary design and manufacturing, blending with raw emotion, desire and passion, creating a truly unique driving experience - ECS - Audi
ECS Tuning recommends this product.

ECS evolutionary design and manufacturing, blending with raw emotion, desire and passion, creating a truly unique driving experience 10X Entries Into Our F80 M3 Sweepstakes

Brand:
ECS - Corporate Logo
ES#:
3619908
Mfg#:
008553ECS01KT
In Stock
ON SALE! SAVE 18%
$2192.99

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

$1799.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

ECS Wheel Spacer & Bolt Kit - 10mm With Black Conical Seat Bolts

ES#2748192 - 00240302A10KT4 - ECS Wheel Spacer & Bolt Kit - 10mm With Black Conical Seat Bolts - Includes everything you need to install spacers on two wheels - ECS - Audi Volkswagen

Includes everything you need to install spacers on two wheels 10X Entries Into Our F80 M3 Sweepstakes

Brand:
ECS - Corporate Logo
ES#:
2748192
Mfg#:
00240302A10KT4
In Stock
ON SALE! SAVE 25%
$140.99

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

$105.74 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Special Active Shocks & Struts Kit

ES#3564213 - 82451264KT - Special Active Shocks & Struts Kit - Superior handling without compromising ride quality - Koni - Audi

Superior handling without compromising ride quality

Brand:
Koni - Corporate Logo
ES#:
3564213
Mfg#:
82451264KT
In Stock
$728.99

This product was last offered at the strikethrough price on
08-26-2026

$727.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Billet Diverter Valve - Polished

ES#3183558 - 034-145-5000-ALU - Billet Diverter Valve - Polished - High-performance spring and piston design is both durable and a performer! - 034Motorsport - Audi Volkswagen

High-performance spring and piston design is both durable and a performer! 2X Entries Into Our F80 M3 Sweepstakes
2 required

Brand:
034Motorsport - Corporate Logo
ES#:
3183558
Mfg#:
034-145-5000-ALU
Ships in 3 Business Days
$128.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Audi B9 S4 Carbon Fiber Rear Diffuser

ES#3247439 - 023797ECS01 - Audi B9 S4 Carbon Fiber Rear Diffuser - Hand-laid carbon fiber to upgrade your exterior styling - ECS - Audi

Hand-laid carbon fiber to upgrade your exterior styling 10X Entries Into Our F80 M3 Sweepstakes

Fits pre-facelift models (up to 2019) without integrated tips in the rear valance

Brand:
ECS - Corporate Logo
ES#:
3247439
Mfg#:
023797ECS01
In Stock
ON SALE! SAVE 42%
$1029.99

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

$599.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Stage 3+ Clutch Kit

ES#2778072 - SA303F-3 - Stage 3+ Clutch Kit - Full faced carbon semi-metallic disc with a torque rating of 595ft/lbs - Spec Clutches - Audi

Full faced carbon semi-metallic disc with a torque rating of 595ft/lbs

Brand:
Spec Clutches - Corporate Logo
ES#:
2778072
Mfg#:
SA303F-3
In Stock
$1109.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

ECS "Stage 4" Front Big Brake Kit - B5/B6/B7/C5

ES#1896 - B5S4S4BBKRXS - ECS "Stage 4" Front Big Brake Kit - B5/B6/B7/C5 - Enhance braking performance with this plug-and-play upgrade! Featuring massive 6-piston calipers, lightweight 2-piece brake rotors, and all components needed for installation. - ECS - Audi

Enhance braking performance with this plug-and-play upgrade! Featuring massive 6-piston calipers, lightweight 2-piece brake rotors, and all components needed for installation. 10X Entries Into Our F80 M3 Sweepstakes

Brand:
ECS - Corporate Logo
ES#:
1896
Mfg#:
B5S4S4BBKRXS
In Stock
ON SALE!
$2039.99

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

$1937.99 USD
Free Shipping
This product is lifetime replacement eligible Partial Replacement

Billet Performance Rear Sway Bar End Links - Audi B8/Porsche Macan

ES#4043135 - 025180ECS02 - Billet Performance Rear Sway Bar End Links - Audi B8/Porsche Macan - Replace the flimsy stock plastic and rubber units - ECS - Audi Porsche

Replace the flimsy stock plastic and rubber units 10X Entries Into Our F80 M3 Sweepstakes

Brand:
ECS - Corporate Logo
ES#:
4043135
Mfg#:
025180ECS02
In Stock
ON SALE! SAVE 20%
$224.99

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

$179.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Billet PCV Vent Tube (06E103213)

ES#4932252 - 057381LA01 - Billet PCV Vent Tube (06E103213) - A durable upgrade over the failure-prone plastic OEM tube! - ECS - Audi

A durable upgrade over the failure-prone plastic OEM tube! 10X Entries Into Our F80 M3 Sweepstakes

Brand:
ECS - Corporate Logo
ES#:
4932252
Mfg#:
057381LA01
In Stock
ON SALE! SAVE 20%
$52.99

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

$42.39 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

AWE ColdFront Intercooler - Audi B9 S4/S5 3.0T

ES#4044047 - 4510-11060 - AWE ColdFront Intercooler - Audi B9 S4/S5 3.0T - Offers a 130% increase in frontal surface area and a massive 83% increase in volume over the factory B9 intercooler - AWE - Audi

Offers a 130% increase in frontal surface area and a massive 83% increase in volume over the factory B9 intercooler 2X Entries Into Our F80 M3 Sweepstakes

Brand:
AWE - Corporate Logo
ES#:
4044047
Mfg#:
4510-11060
In Stock
5% off MSRP

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

$994.99

This product was last offered at the strikethrough price on
10-18-2026

$945.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Audi 3.0T Performance Overdrive Crank Pulley - 187.3mm

ES#4820683 - 025510ECS01 - Audi 3.0T Performance Overdrive Crank Pulley - 187.3mm - Spin the supercharger faster without affecting the accessory drive system - ECS - Audi Volkswagen Porsche

Spin the supercharger faster without affecting the accessory drive system 10X Entries Into Our F80 M3 Sweepstakes
10X Entries For Our Spin To Win Sweepstakes!

Brand:
ECS - Corporate Logo
ES#:
4820683
Mfg#:
025510ECS01
In Stock
ON SALE! SAVE 25%
$344.99

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

$258.74 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Bilstein B16 DampTronic Suspension System

ES#4390702 - 49-290868 - Bilstein B16 DampTronic Suspension System - Features ride height adjustability with dampers compatible with OE electronic damping systems. - Bilstein - Audi

Features ride height adjustability with dampers compatible with OE electronic damping systems. 10X Entries Into Our F80 M3 Sweepstakes
For vehicles with production date from 7/12/2016 with 53mm front strut body

Brand:
Bilstein - Corporate Logo
ES#:
4390702
Mfg#:
49-290868
Back Ordered
31% off MSRP

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

$3611.00

This product was last offered at the strikethrough price on
10-18-2026

$2499.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Street Density Transmission Mount

ES#3199888 - 0345094025 - Street Density Transmission Mount - Improve the performance of the factory transmission mount - 034Motorsport - Audi

Improve the performance of the factory transmission mount 2X Entries Into Our F80 M3 Sweepstakes

Brand:
034Motorsport - Corporate Logo
ES#:
3199888
Mfg#:
0345094025
In Stock
$44.00 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Dynamic+ Adjustable Rear Sway Bar

ES#3241098 - 034-402-1010 - Dynamic+ Adjustable Rear Sway Bar - Designed to combat understeer while reducing body roll under hard cornering! - 034Motorsport - Audi

Designed to combat understeer while reducing body roll under hard cornering! 2X Entries Into Our F80 M3 Sweepstakes

Brand:
034Motorsport - Corporate Logo
ES#:
3241098
Mfg#:
034-402-1010
In Stock
$354.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

LUK Audi RS4 Clutch Kit

ES#2538757 - 078198123G - LUK Audi RS4 Clutch Kit - Revive the response & feel of your transmission with an RS4 clutch - LUK - Audi Volkswagen

Revive the response & feel of your transmission with an RS4 clutch We Price Match - Give Us A Call or Chat!

Brand:
LUK - Corporate Logo
ES#:
2538757
Mfg#:
078198123G
In Stock
$504.89

This product was last offered at the strikethrough price on
05-20-2026

$461.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Track Density Line Motor Mounts Kit

ES#2918007 - 034-509-0048KT - Track Density Line Motor Mounts Kit - Void-free and fluid-free, eliminating the slop associated with the factory mounts - 034Motorsport - Audi

Void-free and fluid-free, eliminating the slop associated with the factory mounts 2X Entries Into Our F80 M3 Sweepstakes

Brand:
034Motorsport - Corporate Logo
ES#:
2918007
Mfg#:
034-509-0048KT
In Stock
$546.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

More About Performance Parts & Upgrades

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