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Audi S4 Performance Parts & Upgrades

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Supertech Inconel Exhaust Valve Set Of 8

+1mm oversized valve head diameter, single groove keeper setup for high RPM use

Brand:
Supertech - Corporate Logo
ES#:
4473987
Mfg#:
AEVI-1106S-8
Ships in 8 Business Days
$357.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

ECS Wheel Spacer & Bolt Kit - 12.5mm / 17.5mm

ES#5481365 - 002403ECS02AKT6 - ECS Wheel Spacer & Bolt Kit - 12.5mm / 17.5mm - Includes everything you'll need to install spacers on four wheels - ECS - Audi Volkswagen

Includes everything you'll need to install spacers on four wheels 10X Entries Into Our F80 M3 Sweepstakes
Fits OEM wheels or wheels that require ball seat wheel bolts

Brand:
ECS - Corporate Logo
ES#:
5481365
Mfg#:
002403ECS02AKT6
In Stock
ON SALE!
$355.39 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Front V5 Slotted Brake Rotors - Set (321x30)

ES#4668252 - 8E0615301AD-S - Front V5 Slotted Brake Rotors - Set (321x30) - Precision manufactured for consistent stopping power during high performance driving. Featuring a matte black zinc coating for corrosion protection. - ECS - Audi

Precision manufactured for consistent stopping power during high performance driving. Featuring a matte black zinc coating for corrosion protection. 10X Entries Into Our F80 M3 Sweepstakes

Brand:
ECS - Corporate Logo
ES#:
4668252
Mfg#:
8E0615301AD-S
Ships in 5 Business Days
ON SALE!
$359.99

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

$349.18 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

360cc Injectors & Fuel Rail Spacer Kit

ES#5071 - FI36-6-KIT - 360cc Injectors & Fuel Rail Spacer Kit - Includes 6 injectors with billet spacers & hardware for installation - Assembled By ECS - Audi

Includes 6 injectors with billet spacers & hardware for installation 10X Entries Into Our F80 M3 Sweepstakes

Brand:
Assembled By ECS - Corporate Logo
ES#:
5071
Mfg#:
FI36-6-KIT
In Stock
$346.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Supercharger Reduction Pulley Upgrade

ES#3220459 - FMSCPS53T - Supercharger Reduction Pulley Upgrade - Contains a Supercharger Reduction Pulley and drive belt for the Audi 3.0T models - Forge - Audi Porsche

Contains a Supercharger Reduction Pulley and drive belt for the Audi 3.0T models

Brand:
Forge - Corporate Logo
ES#:
3220459
Mfg#:
FMSCPS53T
Ships on Nov 13, 2026
$346.99 USD
Free Shipping
on orders $49 and up
Scratch and Dent Item

ECS Carbon Fiber Rear Diffuser - Audi B8 A4/S4 Pre-facelift *Scratch And Dent*

ES#5445457 - 021532ECS01A - ECS Carbon Fiber Rear Diffuser - Audi B8 A4/S4 Pre-facelift *Scratch And Dent* - ***Please see photos and description prior to ordering, all sales final.*** Hand-laid carbon fiber to upgrade your exterior styling - Scratch & Dent - Audi

***Please see photos and description prior to ordering, all sales final.*** Hand-laid carbon fiber to upgrade your exterior styling ALL SALES FINAL. ITEMS MAY BE DAMAGED OR MISSING COMPONENTS. PLEASE SEE IMAGES BEFORE PURCHASING. Want To Haggle? Give Us A Call Or Chat To Make An Offer On This Product!

Brand:
Scratch & Dent - Corporate Logo
ES#:
5445457
Mfg#:
021532ECS01A
In Stock
ON SALE! SAVE 66%
$1019.99

This product was last offered at the strikethrough price on
09-16-2026

$342.99 USD
Free Shipping

Power Stop Z26 Street Warrior Front Brake Kit (320mm)

ES#3990455 - K886-26 - Power Stop Z26 Street Warrior Front Brake Kit (320mm) - A performance front-wheel brake upgrade featuring drilled & slotted rotors and extreme-temperature carbon-fiber ceramic pads. - Power Stop - Audi

A performance front-wheel brake upgrade featuring drilled & slotted rotors and extreme-temperature carbon-fiber ceramic pads.

Brand:
Power Stop - Corporate Logo
ES#:
3990455
Mfg#:
K886-26
Ships in 1 Business Day
$342.99 USD

Front Talon Cross Drilled & Slotted Brake Rotors - Pair (321x30)

ES#3571172 - HTC4766 - Front Talon Cross Drilled & Slotted Brake Rotors - Pair (321x30) - An all new cross drilled and slotted upgrade for your vehicle - Offering performance, durability, and quality in one package! - Hawk - Audi

An all new cross drilled and slotted upgrade for your vehicle - Offering performance, durability, and quality in one package!

Brand:
Hawk - Corporate Logo
ES#:
3571172
Mfg#:
HTC4766
Special Order: No Guaranteed ETA
20% off MSRP

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

$426.99

This product was last offered at the strikethrough price on
10-25-2026

$341.99 USD
This product is lifetime replacement eligible Lifetime Replacement

ECS Performance Engine Mount Kit - Audi B5 S4

ES#2708159 - 000805ECS01AKT - ECS Performance Engine Mount Kit - Audi B5 S4 - Performance engine mounts to increase drivetrain rigidity - ECS - Audi

Performance engine mounts to increase drivetrain rigidity 10X Entries Into Our F80 M3 Sweepstakes

Brand:
ECS - Corporate Logo
ES#:
2708159
Mfg#:
000805ECS01AKT
In Stock
ON SALE!
$358.99

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

$341.04 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

BFI Wheel Spacers - 20mm (Pair)

ES#3022113 - SP90G - BFI Wheel Spacers - 20mm (Pair) - Exclusively built for your 57.1mm centerbore VW/Audi - Black Forest Industries - Audi Volkswagen

Exclusively built for your 57.1mm centerbore VW/Audi

Brand:
Black Forest Industries - Corporate Logo
ES#:
3022113
Mfg#:
SP90G
Ships in 1 Business Day
$84.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Sport Springs - Set

ES#4875 - 50310 - Sport Springs - Set - Unrivaled comfort and performance. Average lowering of 1.2"F 1.2"R - H&R - Audi

Unrivaled comfort and performance. Average lowering of 1.2"F 1.2"R We Price Match - Give Us A Call or Chat!
Fits Cabrio models only

Brand:
H&R - Corporate Logo
ES#:
4875
Mfg#:
50310
Ships in 3 Business Days
15% off MSRP

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

$399.00

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

$339.15 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Super Sport Springs - Set

ES#2713632 - 50377-77 - Super Sport Springs - Set - Aggressive stance with an average lowering of 2.0"F 1.75"R - H&R - Audi

Aggressive stance with an average lowering of 2.0"F 1.75"R We Price Match - Give Us A Call or Chat!
Fits Sedan models only

Brand:
H&R - Corporate Logo
ES#:
2713632
Mfg#:
50377-77
Ships in 3 Business Days
15% off MSRP

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

$399.00

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

$339.15 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Racingline Sport Spring Set

ES#3570412 - VWR3141S4 - Racingline Sport Spring Set - Give your B9 S4 the ride height it deserves - The first upgrade to make to your car! - Racingline - Audi

Give your B9 S4 the ride height it deserves - The first upgrade to make to your car!

Brand:
Racingline - Corporate Logo
ES#:
3570412
Mfg#:
VWR3141S4
Ships in 2 Business Days
$338.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Transmission Street Shield Skid Plate Hardware Kit

ES#3470642 - 017881ecs01KT2 - Transmission Street Shield Skid Plate Hardware Kit - Replacement hardware kit for your ECS Transmission Street Shield - ECS - Audi

Replacement hardware kit for your ECS Transmission Street Shield 10X Entries Into Our F80 M3 Sweepstakes

Brand:
ECS - Corporate Logo
ES#:
3470642
Mfg#:
017881ECS01KT2
In Stock
ON SALE! SAVE 10%
$124.99

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

$112.49 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

More About Performance Parts & Upgrades

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