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Audi S4 Most Popular Parts

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Performance Ignition Coils - Set Of Six

ES#4620042 - 06E905115G-6KT - Performance Ignition Coils - Set Of Six - Increased energy output over stock coil packs for a stronger and more consistent spark! - ECS - Audi

Increased energy output over stock coil packs for a stronger and more consistent spark! 10X Entries Into Our F80 M3 Sweepstakes

To be used with the 2.0T coil pack conversion kits.

Brand:
ECS - Corporate Logo
ES#:
4620042
Mfg#:
06E905115G-6KT
In Stock
ON SALE! SAVE 15%
$203.99

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

$173.39 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Audi B9 S4/S5 Sportback 3.0T Valved Exhaust System

ES#4369839 - 026018ECS - Audi B9 S4/S5 Sportback 3.0T Valved Exhaust System - ECS evolutionary design and manufacturing, blending with raw emotion, desire and passion, creating a truly unique driving experience - ECS - Audi

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#:
4369839
Mfg#:
026018ECS
Ships in 8 Business Days
ON SALE!
Starting at $1457.77 USD
Customize
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Audi B9 A4/S4/A5 Engine Street Shield Aluminum Skid Plate

ES#3411957 - 019207ecs01KT - Audi B9 A4/S4/A5 Engine Street Shield Aluminum Skid Plate - Protect your vehicle's plastic oil pan with this 4mm thick aluminum skid plate - ECS - Audi

Protect your vehicle's plastic oil pan with this 4mm thick aluminum skid plate 10X Entries Into Our F80 M3 Sweepstakes

Brand:
ECS - Corporate Logo
ES#:
3411957
Mfg#:
019207ECS01KT
In Stock
$394.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Complete Valve Cover Gasket Kit

ES#3662304 - 06b103831jKT - Complete Valve Cover Gasket Kit - Includes gaskets, hardware, and silicone sealant for an all-inclusive service kit - Assembled By ECS - Audi

Includes gaskets, hardware, and silicone sealant for an all-inclusive service kit 10X Entries Into Our F80 M3 Sweepstakes

Brand:
Assembled By ECS - Corporate Logo
ES#:
3662304
Mfg#:
06B103831JKT
In Stock
ON SALE! SAVE 18%
$241.99

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

$197.89 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Partial Replacement

B8 S4/S5/Q5 3.0T Downpipes With Resonator Deletes

ES#4714616 - 012616LA01-01KT - B8 S4/S5/Q5 3.0T Downpipes With Resonator Deletes - Change the tone of your 3.0T exhaust with easy-to-install downpipes that mate to your factory cat-back exhaust. - ECS - Audi

Change the tone of your 3.0T exhaust with easy-to-install downpipes that mate to your factory cat-back exhaust. 10X Entries Into Our F80 M3 Sweepstakes

Brand:
ECS - Corporate Logo
ES#:
4714616
Mfg#:
012616LA01-01KT
In Stock
ON SALE! SAVE 25%
$560.99

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

$420.74 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Carbon Fiber ECU Cover - Audi B9 S4/S5/RS5

ES#3247906 - 024249ECS01 - Carbon Fiber ECU Cover - Audi B9 S4/S5/RS5 - Compliment your engine bay and hide away the exposed ECU - ECS - Audi

Compliment your engine bay and hide away the exposed ECU 10X Entries Into Our F80 M3 Sweepstakes

Brand:
ECS - Corporate Logo
ES#:
3247906
Mfg#:
024249ECS01
In Stock
ON SALE! SAVE 20%
$239.99

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

$191.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Ultimate Pressure Control Valve (PCV) Service Kit

ES#4487400 - 06E103547AHKT - Ultimate Pressure Control Valve (PCV) Service Kit - Comprehensive kit includes new oil separator, supercharger gaskets, vent tube o-rings, and ECS coolant bleeder screw kit. - Assembled By ECS - Audi
ECS Tuning recommends this product.

Comprehensive kit includes new oil separator, supercharger gaskets, vent tube o-rings, and ECS coolant bleeder screw kit. 10X Entries Into Our F80 M3 Sweepstakes
Fits from the 2013 model year

Brand:
Assembled By ECS - Corporate Logo
ES#:
4487400
Mfg#:
06E103547AHKT
In Stock
ON SALE! SAVE 16%
$346.99

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

$292.62 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Partial 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!

Brand:
APR - Corporate Logo
ES#:
4901469
Mfg#:
CBK0012
In Stock
ON SALE!
$2049.99

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

$1933.95 USD
Free Shipping

Res-X Front Resonator Delete

ES#4845334 - 034-105-7060 - Res-X Front Resonator Delete - Unleash a throaty growl under hard acceleration! - 034Motorsport - Audi

Unleash a throaty growl under hard acceleration! 2X Entries Into Our F80 M3 Sweepstakes

Brand:
034Motorsport - Corporate Logo
ES#:
4845334
Mfg#:
034-105-7060
In Stock
$303.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

CTS Turbo B9 S4/S5 High Flow Cat

ES#4043052 - CTS-EXH-TP-0009C - CTS Turbo B9 S4/S5 High Flow Cat - CTS Turbo high flow cat is made to maximize exhaust flow for highest power gains - Do not compromise performance and sound with factory parts - Unleash your B9 S4/S5 3.0T Potential! - CTS - Audi

CTS Turbo high flow cat is made to maximize exhaust flow for highest power gains - Do not compromise performance and sound with factory parts - Unleash your B9 S4/S5 3.0T Potential!

Brand:
CTS - Corporate Logo
ES#:
4043052
Mfg#:
CTS-EXH-TP-0009C
In Stock
ON SALE! SAVE 15%
$699.99

This product was last offered at the strikethrough price on
09-29-2026

$594.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Wheel Bearing Kit - Pair

ES#2918988 - 4H0498625AKT - Wheel Bearing Kit - Pair - Includes both bearings with axle & securing bolts - FAG - Audi
ECS Tuning recommends this product.

Includes both bearings with axle & securing bolts

Brand:
FAG - Corporate Logo
ES#:
2918988
Mfg#:
4H0498625AKT
In Stock
$300.99

This product was last offered at the strikethrough price on
06-04-2026

$237.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

High Pressure Fuel Pump Piston Upgrade Kit

ES#4475572 - 034-106-6052 - High Pressure Fuel Pump Piston Upgrade Kit - Yields up to 50% Flow Increase Over the Factory High Pressure Fuel Pump! - 034Motorsport - Audi

Yields up to 50% Flow Increase Over the Factory High Pressure Fuel Pump! 2X Entries Into Our F80 M3 Sweepstakes

Brand:
034Motorsport - Corporate Logo
ES#:
4475572
Mfg#:
034-106-6052
In Stock
$390.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

ECS Tuning Billet Engine Oil Dipstick - Black Anodized

ES#3545565 - 023954ECS01-02 - ECS Tuning Billet Engine Oil Dipstick - Black Anodized - A beautiful addition and durable upgrade for your engine - ECS - Audi

A beautiful addition and durable upgrade for your engine 10X Entries Into Our F80 M3 Sweepstakes

Brand:
ECS - Corporate Logo
ES#:
3545565
Mfg#:
023954ECS01-02
In Stock
ON SALE! SAVE 25%
$104.99

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

$78.74 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Density Line Front Upper Control Arm Kit

ES#3199968 - 034-401-1042 - Density Line Front Upper Control Arm Kit - Refresh your front end with 034Motorsport's front upper control arm kit - 034Motorsport - Audi Porsche

Refresh your front end with 034Motorsport's front upper control arm kit 2X Entries Into Our F80 M3 Sweepstakes

Brand:
034Motorsport - Corporate Logo
ES#:
3199968
Mfg#:
034-401-1042
In Stock
$337.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

RacingLine Oil Catch Can System - B9 S4/S5/SQ5

ES#4620271 - VWR131000 - RacingLine Oil Catch Can System - B9 S4/S5/SQ5 - Features a complete PCV replacement block feeding to an internally-baffled can to eliminate oil-build-up in the intercooler and inlet tract - Racingline - Audi

Features a complete PCV replacement block feeding to an internally-baffled can to eliminate oil-build-up in the intercooler and inlet tract

Brand:
Racingline - Corporate Logo
ES#:
4620271
Mfg#:
VWR131000
Ships in 1 Business Day
$1117.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

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