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Audi S4 Most Popular Parts

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Audi B9 S4/S5 3.0T Performance Baffled Oil Catch Can System

ES#4044357 - 023952ecs01KT - Audi B9 S4/S5 3.0T Performance Baffled Oil Catch Can System - Keep your intake tract clean and carbon free - ECS - Audi

Keep your intake tract clean and carbon free 10X Entries Into Our F80 M3 Sweepstakes

Brand:
ECS - Corporate Logo
ES#:
4044357
Mfg#:
023952ECS01KT
In Stock
ON SALE! SAVE 15%
$555.07

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

$471.81 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

JHM HD Overdrive Lightweight Supercharger Crank Pulley (187mm)

ES#4045868 - 06E105251F-187mm - JHM HD Overdrive Lightweight Supercharger Crank Pulley (187mm) - Eliminates the problematic two-piece design and rubber isolator found in the stock crank pulley while reducing the mass of the motor's rotating assembly. - JH Motorsports - Audi Volkswagen Porsche

Eliminates the problematic two-piece design and rubber isolator found in the stock crank pulley while reducing the mass of the motor's rotating assembly. *To be used with 'Stage 2' software or software specific to a supercharger crank pulley upgrade*

Brand:
JH Motorsports - Corporate Logo
ES#:
4045868
Mfg#:
06E105251F-187MM
Ships in 6 Business Days
$324.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Billet Diverter Valve - Black

ES#3183557 - 034-145-5000-BLK - Billet Diverter Valve - Black - 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#:
3183557
Mfg#:
034-145-5000-BLK
In Stock
$134.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Front 2-Piece Brake Rotors - Pair (350x34)

ES#4429973 - 034-301-1008 - Front 2-Piece Brake Rotors - Pair (350x34) - 034Motorsport 350mmx34mm 2-Piece Floating Front Brake Rotor Upgrade Kit - 034Motorsport - Audi

034Motorsport 350mmx34mm 2-Piece Floating Front Brake Rotor Upgrade Kit 2X Entries Into Our F80 M3 Sweepstakes

Brand:
034Motorsport - Corporate Logo
ES#:
4429973
Mfg#:
034-301-1008
In Stock
$1050.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Audi B8.5 S4 / A4 S-Line Forged Carbon Fiber Rear Diffuser

ES#4490851 - 018359ECS01-02 - Audi B8.5 S4 / A4 S-Line Forged Carbon Fiber Rear Diffuser - Hand-laid chopped carbon fiber to upgrade your exterior styling - ECS - Audi

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

From the 2013 model year

Brand:
ECS - Corporate Logo
ES#:
4490851
Mfg#:
018359ECS01-02
In Stock
ON SALE! SAVE 30%
$998.99

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

$699.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Carbon Fiber Rear Diffuser - Audi B8 A4/S4 Pre-facelift

ES#3200799 - 021532ECS01A - Carbon Fiber Rear Diffuser - Audi B8 A4/S4 Pre-facelift - 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

Up to the 2012 model year

Brand:
ECS - Corporate Logo
ES#:
3200799
Mfg#:
021532ECS01A
In Stock
ON SALE! SAVE 30%
$999.99

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

$699.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Fuel Pump Cam Follower

ES#2793783 - 06H109311B - Fuel Pump Cam Follower - Recommended to be replaced when replacing fuel pump - Ina - Audi BMW Volkswagen MINI

Recommended to be replaced when replacing fuel pump We Price Match - Give Us A Call or Chat!

Brand:
Ina - Corporate Logo
ES#:
2793783
Mfg#:
06H109311B
In Stock
$29.99

This product was last offered at the strikethrough price on
09-02-2026

$28.95 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Ignition Service Kit

ES#2539163 - 101905631GKT - Ignition Service Kit - Includes six OE red coil packs and six NGK spark plugs - Assembled By ECS - Audi
ECS Tuning recommends this product.

Includes six OE red coil packs and six NGK spark plugs 10X Entries Into Our F80 M3 Sweepstakes

Brand:
Assembled By ECS - Corporate Logo
ES#:
2539163
Mfg#:
101905631GKT
In Stock
ON SALE!
$266.99

This product was last offered at the strikethrough price on
09-20-2026

$253.98 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

B8 Sport Rear Shock Kit

ES#4430379 - 24-145992KT - B8 Sport Rear Shock Kit - Fits the left and right side - Bilstein - Audi

Fits the left and right side 10X Entries Into Our F80 M3 Sweepstakes

Vehicles equipped with Electronic Damping Control (EDC) will lose shock dampening and receive a system error code

Brand:
Bilstein - Corporate Logo
ES#:
4430379
Mfg#:
24-145992KT
In Stock
$310.00 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

D1S 5000K XB Xenon Bulb - Pair

ES#4212774 - MM.N.073 - D1S 5000K XB Xenon Bulb - Pair - Quality replacement xenon bulbs from Morimoto - Morimoto - Audi BMW Volkswagen Mercedes Benz MINI

Quality replacement xenon bulbs from Morimoto

Brand:
Morimoto - Corporate Logo
ES#:
4212774
Mfg#:
MM.N.073
In Stock
15% off MSRP

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

$112.00

This product was last offered at the strikethrough price on
10-22-2026

$94.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

1-Piece Front Brake Rotor Upgrade Kit - Pair (350mm X 34mm)

ES#5446386 - 034-301-1024 - 1-Piece Front Brake Rotor Upgrade Kit - Pair (350mm X 34mm) - Geomet Anti-Corrosion Coating, CM-250 Special Alloy Designed Specifically To Reduce Warping from Hard Street Use - 034Motorsport - Audi

Geomet Anti-Corrosion Coating, CM-250 Special Alloy Designed Specifically To Reduce Warping from Hard Street Use 2X Entries Into Our F80 M3 Sweepstakes

Brand:
034Motorsport - Corporate Logo
ES#:
5446386
Mfg#:
034-301-1024
Ships in 3 Business Days
$397.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Billet Tunnel Brace - Black - Audi B8/Porsche Macan

ES#3569140 - 023780ECS01-01 - Billet Tunnel Brace - Black - Audi B8/Porsche Macan - Replace your small and weak stamped brace with heavy-duty billet aluminum! - ECS - Audi Porsche

Replace your small and weak stamped brace with heavy-duty billet aluminum! 10X Entries Into Our F80 M3 Sweepstakes

Brand:
ECS - Corporate Logo
ES#:
3569140
Mfg#:
023780ECS01-01
In Stock
ON SALE! SAVE 25%
$170.99

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

$128.24 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

X34 Cold Air Intake - Carbon Fiber

ES#2864558 - 034-108-1002-CF - X34 Cold Air Intake - Carbon Fiber - The ultimate cold air induction system the for powerful 2.7T! - 034Motorsport - Audi

The ultimate cold air induction system the for powerful 2.7T! 2X Entries Into Our F80 M3 Sweepstakes

Brand:
034Motorsport - Corporate Logo
ES#:
2864558
Mfg#:
034-108-1002-CF
In Stock
$595.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

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