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Audi S4 Most Popular Parts

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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

Brand:
AWE - Corporate Logo
ES#:
4044047
Mfg#:
4510-11060
In Stock
$945.00 USD
This product is lifetime replacement eligible Lifetime Replacement

APR Iridium Pro Spark Plugs - Priced Each

ES#4905500 - Z1004081 - APR Iridium Pro Spark Plugs - Priced Each - Designed for high performance / tuned vehicle applications - APR - Audi Porsche

Designed for high performance / tuned vehicle applications Call In Or Chat For Best Price! 5X Entries For Our 25th Anniversary Sweepstakes!

Brand:
APR - Corporate Logo
ES#:
4905500
Mfg#:
Z1004081
In Stock
13% off MSRP

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

$30.99

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

$26.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

ECS Tuning Transmission Street Shield Skid Plate Kit - Audi B8

ES#3411961 - 017881ecs01KT - ECS Tuning Transmission Street Shield Skid Plate Kit - Audi B8 - Protect your vehicle's transmission pan with a 4mm thick aluminum skid plate - ECS - Audi

Protect your vehicle's transmission pan with a 4mm thick aluminum skid plate 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
ECS - Corporate Logo
ES#:
3411961
Mfg#:
017881ECS01KT
In Stock
ON SALE! SAVE 20%
$505.70

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

$404.56 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 For Our 25th Anniversary 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 34%
$1029.99

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

$679.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

B8/B8.5 A4/S4 Lowering Spring Set

ES#4620230 - 047330LA01 - B8/B8.5 A4/S4 Lowering Spring Set - Dramatically improve looks and handling with and average lowering up to 1.6" front and rear. - ECS - Audi

Dramatically improve looks and handling with and average lowering up to 1.6" front and rear. 10X Entries For Our 25th Anniversary Sweepstakes!
Manufactured 100% in the USA

Brand:
ECS - Corporate Logo
ES#:
4620230
Mfg#:
047330LA01
In Stock
ON SALE!
$285.99

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

$276.74 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

AWE Non-Resonated Downpipes - Audi 3.0T

ES#4043944 - 3220-11010 - AWE Non-Resonated Downpipes - Audi 3.0T - Suited for owners seeking a "loud" and aggressive sounding system. - AWE - Audi

Suited for owners seeking a "loud" and aggressive sounding system.

Brand:
AWE - Corporate Logo
ES#:
4043944
Mfg#:
3220-11010
In Stock
$745.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Ultimate Supercharger Service Kit

ES#4766226 - 06E145621SA2KT - Ultimate Supercharger Service Kit - Fix all possible coolant leaks for your 3.0T in one click! - Assembled By ECS - Audi

Fix all possible coolant leaks for your 3.0T in one click! 10X Entries For Our 25th Anniversary Sweepstakes!
Up to through the 2012 model year

Brand:
Assembled By ECS - Corporate Logo
ES#:
4766226
Mfg#:
06E145621SA2KT
In Stock
ON SALE!
$750.03

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

$704.04 USD
Free Shipping
This product is lifetime replacement eligible Partial Replacement

IE TrueFlex Sensor Kit For Audi B9 S4, S5, SQ5

ES#4830270 - IEELCK2 - IE TrueFlex Sensor Kit For Audi B9 S4, S5, SQ5 - Plug-&-play kit for iE B9/B9.5 3.0T TrueFlex Tunes - Integrated Engineering - Audi

Plug-&-play kit for iE B9/B9.5 3.0T TrueFlex Tunes 5X Entries For Our 25th Anniversary Sweepstakes!

Brand:
Integrated Engineering - Corporate Logo
ES#:
4830270
Mfg#:
IEELCK2
In Stock
$461.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Front & Rear Performance Brake Service Kit

ES#4475287 - 4M0615301AN5KT - Front & Rear Performance Brake Service Kit - Featuring Zimmermann Cross-Drilled rotors and ECS EP24 Performance Brake pads - Includes set screws, brake wear sensors, and silicone brake lubricant - Assembled By ECS - Audi

Featuring Zimmermann Cross-Drilled rotors and ECS EP24 Performance Brake pads - Includes set screws, brake wear sensors, and silicone brake lubricant 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
Assembled By ECS - Corporate Logo
ES#:
4475287
Mfg#:
4M0615301AN5KT
In Stock
ON SALE! SAVE 30%
$1173.99

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

$819.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

19" Style 628 Wheels - Set Of Four

ES#4324952 - 628-14KT1 - 19" Style 628 Wheels - Set Of Four - 19x8.5 ET35 5x112 57.1CB - Matte Gunmetal/Machined Face - Alzor - Audi Volkswagen

19x8.5 ET35 5x112 57.1CB - Matte Gunmetal/Machined Face 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
Alzor - Corporate Logo
ES#:
4324952
Mfg#:
628-14KT1
In Stock
ON SALE! SAVE 25%
$1310.00

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

$982.50 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

High Performance Aluminum Radiator

ES#4346249 - 7091 - High Performance Aluminum Radiator - Featuring an all-aluminum tank and core plus OE-style quick connects. Lower engine temperatures mean more power and longer life of engine components! - CSF - Audi

Featuring an all-aluminum tank and core plus OE-style quick connects. Lower engine temperatures mean more power and longer life of engine components! 2X Entries For Our 25th Anniversary Sweepstakes!
Fits models with DSG (S-Tronic) transmission only

Brand:
CSF - Corporate Logo
ES#:
4346249
Mfg#:
7091
In Stock
$699.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Wheel Spacer & Bolt Kit - 12.5mm with Black Ball Seat Bolts

ES#2863233 - 002403ECS02AKT3 - Wheel Spacer & Bolt Kit - 12.5mm 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#:
2863233
Mfg#:
002403ECS02AKT3
In Stock
ON SALE! SAVE 25%
$189.99

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

$142.49 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Front & Rear Brake Pad Kit - EBC YellowStuff

ES#4159088 - dp42277rKT - Front & Rear Brake Pad Kit - EBC YellowStuff - EBC's premium sport street pad that offers high friction levels and heat fade resistance - EBC - Audi

EBC's premium sport street pad that offers high friction levels and heat fade resistance 2X Entries For Our 25th Anniversary Sweepstakes!

Brand:
EBC - Corporate Logo
ES#:
4159088
Mfg#:
DP42277RKT
In Stock
$374.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Audi B7 S4 Catback Exhaust

ES#4876874 - 012390LA - Audi B7 S4 Catback Exhaust - Choose your own configuration along with your choice of exhaust tips and more! - ECS - Audi

Choose your own configuration along with your choice of exhaust tips and more! 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
ECS - Corporate Logo
ES#:
4876874
Mfg#:
012390LA
Ships on Oct 29, 2026
ON SALE!
Starting at $857.48 USD
Customize
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
Ships on Aug 7, 2026
Auto Notify
ON SALE! SAVE 20%
$729.99

This product was last offered at the strikethrough price on
02-27-2026

$581.71 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

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