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Audi S4 Most Popular Parts

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B9 A4 / S4 Lowering Spring Set

ES#4714528 - 051204LA01-A - B9 A4 / S4 Lowering Spring Set - Dramatically improve looks and handling with and average lowering up to 1.5" front and rear. - ECS - Audi

Dramatically improve looks and handling with and average lowering up to 1.5" front and rear. 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
ECS - Corporate Logo
ES#:
4714528
Mfg#:
051204LA01-A
In Stock
ON SALE! SAVE 10%
$315.99

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

$284.39 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Oil Separator/Pressure Control Valve (PCV)

ES#4620647 - 06E103547AC - Oil Separator/Pressure Control Valve (PCV) - Located beneath the supercharger compressor - Hengst - Audi Porsche
ECS Tuning recommends this product.

Located beneath the supercharger compressor 10X Entries For Our 25th Anniversary Sweepstakes!
We Price Match - Give Us A Call or Chat!
Up to the 2012 model year

Brand:
Hengst - Corporate Logo
ES#:
4620647
Mfg#:
06E103547AC
In Stock
$130.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

APR Cat-Back Exhaust System - B9 S4/S5

ES#4901469 - CBK0012 - APR Cat-Back Exhaust System - B9 S4/S5 - Features TIG welded brushed T304 stainless steel construction and offers gains of 10 AWHP and 12 AWFT-LBS of torque - APR - Audi

Features TIG welded brushed T304 stainless steel construction and offers gains of 10 AWHP and 12 AWFT-LBS of torque Call In Or Chat For Best Price! 5X Entries For Our 25th Anniversary Sweepstakes!

Brand:
APR - Corporate Logo
ES#:
4901469
Mfg#:
CBK0012
In Stock
24% off MSRP

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

$2418.99

This product was last offered at the strikethrough price on
04-22-2026

$1827.99 USD
Free Shipping

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

ES#2748191 - 00240302A10KT3 - ECS Wheel Spacer & Bolt Kit - 10mm With Black Ball 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 For Our 25th Anniversary Sweepstakes!

Brand:
ECS - Corporate Logo
ES#:
2748191
Mfg#:
00240302A10KT3
Ships in 1-2 days
ON SALE! SAVE 25%
$197.93

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

$148.45 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

IE 3.0T High Pressure Fuel Pump (HPFP) Upgrade

ES#4040277 - IEFUVJ1 - IE 3.0T High Pressure Fuel Pump (HPFP) Upgrade - The IE HPFP Upgrade is the missing link to provide enough fuel for dual pulley setups attempting big power on higher octane fuels. - Integrated Engineering - Audi

The IE HPFP Upgrade is the missing link to provide enough fuel for dual pulley setups attempting big power on higher octane fuels. 5X Entries For Our 25th Anniversary Sweepstakes!

Brand:
Integrated Engineering - Corporate Logo
ES#:
4040277
Mfg#:
IEFUVJ1
In Stock
$1049.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Complete Rear Differential Mount Insert Kit

ES#2992521 - 008288ecs01KT - Complete Rear Differential Mount Insert Kit - Increase drivetrain rigidity and response! - ECS - Audi Porsche

Increase drivetrain rigidity and response! 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
ECS - Corporate Logo
ES#:
2992521
Mfg#:
008288ECS01KT
In Stock
ON SALE! SAVE 25%
$196.99

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

$147.74 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Wheel Spacer & Bolt Kit - 20mm With Black Ball Seat Bolts

ES#2748291 - 6-ECS-024 - Wheel Spacer & Bolt Kit - 20mm With Black Ball Seat Bolts - Add some style to your Audi with these wheel spacers - ECS - Audi

Add some style to your Audi with these wheel spacers 10X Entries For Our 25th Anniversary Sweepstakes!
Fits OEM wheels, or wheels that use OEM ball seat wheel bolts

Brand:
ECS - Corporate Logo
ES#:
2748291
Mfg#:
6-ECS-024
Ships in 4 Business Days
ON SALE! SAVE 15%
$187.99

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

$159.79 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Adjustable Metal Extended Slave Cylinder

ES#4819123 - SLV01A0 - Adjustable Metal Extended Slave Cylinder - THE solution to the B8/8.5 Push Clutch to Start issue - Includes 3 different rods (stock, extended, very extended) - JXB Performance - Audi

THE solution to the B8/8.5 Push Clutch to Start issue - Includes 3 different rods (stock, extended, very extended)

Brand:
JXB Performance - Corporate Logo
ES#:
4819123
Mfg#:
SLV01A0
In Stock
$239.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Synthoil Premium Engine Oil (5w-40) - 5 Liter

ES#258725 - 2041 - Synthoil Premium Engine Oil (5w-40) - 5 Liter - A fully synthetic oil specifically designed around the unique needs and long drain intervals of European engines - Liqui-Moly - Audi BMW Volkswagen

A fully synthetic oil specifically designed around the unique needs and long drain intervals of European engines 10X Entries For Our 25th Anniversary Sweepstakes!
We Price Match - Give Us A Call or Chat!

Brand:
Liqui-Moly - Corporate Logo
ES#:
258725
Mfg#:
2041
In Stock
42% off MSRP

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

$94.99

This product was last offered at the strikethrough price on
07-22-2026

$55.29 USD
Free Shipping
on orders $49 and up

Audi B9 S4/A4 Trunk Spoiler - Gloss Black

ES#3981207 - 028801ECS01 - Audi B9 S4/A4 Trunk Spoiler - Gloss Black - Add some aggressive styling to your Audi! - ECS - Audi

Add some aggressive styling to your Audi! 10X Entries For Our 25th Anniversary Sweepstakes!

Requires removal of the factory trunk spoiler

Brand:
ECS - Corporate Logo
ES#:
3981207
Mfg#:
028801ECS01
In Stock
ON SALE! SAVE 25%
$289.99

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

$217.49 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

IE Race Series FDS Intercooler System - B9/B9.5 S4/S5

ES#4698448 - IETPCK5 - IE Race Series FDS Intercooler System - B9/B9.5 S4/S5 - Increase horsepower and eliminate heatsoak - 280% larger than stock core! - Integrated Engineering - Audi

Increase horsepower and eliminate heatsoak - 280% larger than stock core! 5X Entries For Our 25th Anniversary Sweepstakes!
Requires IE Aluminum Charge Pipe Kit for installation (ES4685216)

Brand:
Integrated Engineering - Corporate Logo
ES#:
4698448
Mfg#:
IETPCK5
Back Ordered
Auto Notify
$1414.99 USD
Free Shipping

Street Density Line Motor Mount Kit - 50 Durometer

ES#4491679 - 034-509-5036 - Street Density Line Motor Mount Kit - 50 Durometer - 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

Brand:
034Motorsport - Corporate Logo
ES#:
4491679
Mfg#:
034-509-5036
In Stock
$449.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Audi B9 A4 / S4 Flat Side Skirts - Gloss Black

ES#4163869 - 001734la01 - Audi B9 A4 / S4 Flat Side Skirts - Gloss Black - Enhance your side profile with an aggressive look! - ECS - Audi

Enhance your side profile with an aggressive look! 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
ECS - Corporate Logo
ES#:
4163869
Mfg#:
001734LA01
In Stock
ON SALE! SAVE 20%
$363.99

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

$291.19 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Bilstein B14 PSS Suspension System

ES#2984041 - 47-119444 - Bilstein B14 PSS Suspension System - Height adjustable suspension system with performance valving and application specific, progressive rate coil springs. World-famous Bilstein quality with a limited lifetime warranty! - Bilstein - Audi

Height adjustable suspension system with performance valving and application specific, progressive rate coil springs. World-famous Bilstein quality with a limited lifetime warranty! 2X Entries For Our 25th Anniversary Sweepstakes!
Dynamic Ride Control (DRC) must be removed. Fits sedan, avant, and cabriolet models

Brand:
Bilstein - Corporate Logo
ES#:
2984041
Mfg#:
47-119444
In Stock
31% off MSRP

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

$1791.00

This product was last offered at the strikethrough price on
07-22-2026

$1239.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Performance Aluminum Charge Pipe Kit

ES#4685216 - IETPCK6 - Performance Aluminum Charge Pipe Kit - Eliminate factory bottlenecks and weak plastic materials for increased flow and strength. - Integrated Engineering - Audi

Eliminate factory bottlenecks and weak plastic materials for increased flow and strength. 5X Entries For Our 25th Anniversary Sweepstakes!

Brand:
Integrated Engineering - Corporate Logo
ES#:
4685216
Mfg#:
IETPCK6
In Stock
$447.99 USD
Free Shipping

3.0T Billet Aluminum Thermostat - 80°C

ES#4876046 - 053120LA02 - 3.0T Billet Aluminum Thermostat - 80C - Ditch your failure-prone OE plastic thermostat with a high-performance, billet aluminum alternative! - ECS - Audi Volkswagen

Ditch your failure-prone OE plastic thermostat with a high-performance, billet aluminum alternative! 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
ECS - Corporate Logo
ES#:
4876046
Mfg#:
053120LA02
Ships on Sep 4, 2026
ON SALE! SAVE 15%
$405.99

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

$345.09 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

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