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Audi S4 Engine Parts & Accessories

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Front Oxygen Sensor

ES#3604972 - 06M906265 - Front Oxygen Sensor - Keep your engine running efficiently - Genuine Volkswagen Audi - Audi

Keep your engine running efficiently Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
3604972
Mfg#:
06M906265
Ships in 3 Business Days
10% off MSRP

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

$298.99

This product was last offered at the strikethrough price on
10-26-2026

$268.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

IE Carbon Fiber Intake Lid

ES#3660590 - IEINCG4 - IE Carbon Fiber Intake Lid - Add some style, class, and sporty look to your IE S4 or S5 3.0T Cold Air Intake with this direct-fit carbon fiber lid! - Integrated Engineering - Audi

Add some style, class, and sporty look to your IE S4 or S5 3.0T Cold Air Intake with this direct-fit carbon fiber lid! Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply
To be used in Integrated Engineering Cold Air Intake System: IEINCG2A or IEINSG1

Brand:
Integrated Engineering - Corporate Logo
ES#:
3660590
Mfg#:
IEINCG4
In Stock
$321.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Serpentine Belt

ES#3181973 - 06M903137T - Serpentine Belt - Replace your worn belt today before it breaks - Genuine Volkswagen Audi - Audi

Replace your worn belt today before it breaks Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
3181973
Mfg#:
06M903137T
Ships in 1-2 days
9% off MSRP

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

$76.99

This product was last offered at the strikethrough price on
10-26-2026

$69.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

JHM High Flow Downpipe Kit

ES#4505214 - JHM-B8DPPDK - JHM High Flow Downpipe Kit - Catted Downpipes with or without X pipe and with or without Integrated Baffling! - JH Motorsports - Audi

Catted Downpipes with or without X pipe and with or without Integrated Baffling! Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply

Brand:
JH Motorsports - Corporate Logo
ES#:
4505214
Mfg#:
JHM-B8DPPDK
Ships in 10 Business Days
Starting at $0.00 USD
Customize
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

CTS Street Sport Engine Mount Kit

ES#4140455 - cts-em-b8-50dKT - CTS Street Sport Engine Mount Kit - 50 Durometer rubber construction - Set of two mounts for left and right sides - CTS - Audi

50 Durometer rubber construction - Set of two mounts for left and right sides Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply

Brand:
CTS - Corporate Logo
ES#:
4140455
Mfg#:
CTS-EM-B8-50DKT
Ships in 3 Business Days
$399.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

JHM Fuel Pump Upgrade Kit - High-Flow 340 LPH w/ Drop-In Adapter

ES#4045937 - B5340LPFP - JHM Fuel Pump Upgrade Kit - High-Flow 340 LPH w/ Drop-In Adapter - Drop in kit to work in conjunction with your factory fuel system - JH Motorsports - Audi

Drop in kit to work in conjunction with your factory fuel system Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply

Brand:
JH Motorsports - Corporate Logo
ES#:
4045937
Mfg#:
B5340LPFP
Ships on Nov 13, 2026
$399.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

3.5" Cone Style Air Filter

ES#4304100 - CTS-AF-250 - 3.5" Cone Style Air Filter - Replacement filter for CTS-IT-300R and CTS-IT-938 - CTS - Audi

Replacement filter for CTS-IT-300R and CTS-IT-938 Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply

Brand:
CTS - Corporate Logo
ES#:
4304100
Mfg#:
CTS-AF-250
In Stock
ON SALE! SAVE 20%
$99.99

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

$79.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

CTS B-Cool Billet Oil Filter Housing

ES#3660001 - CTS-HW-0243 - CTS B-Cool Billet Oil Filter Housing - Offering great looks and heat dissipation - Not only does the B-Cool filter look good, but it works great! - CTS - Audi

Offering great looks and heat dissipation - Not only does the B-Cool filter look good, but it works great! Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply

Brand:
CTS - Corporate Logo
ES#:
3660001
Mfg#:
CTS-HW-0243
In Stock
ON SALE! SAVE 20%
$79.99

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

$63.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Audi EA839 3.0T W.2 ECU Tune

ES#4715345 - 05-839-00132-1KT - Audi EA839 3.0T W.2 ECU Tune - Increase of +81 Horsepower, and +126 Torque! Eliminate top speed limiter, Increased throttle response. W.2 Tunes are designed for vehicles with performance exhausts & high-flow air filters! - Weistec - Audi

Increase of +81 Horsepower, and +126 Torque! Eliminate top speed limiter, Increased throttle response. W.2 Tunes are designed for vehicles with performance exhausts & high-flow air filters! Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply

Brand:
Weistec - Corporate Logo
ES#:
4715345
Mfg#:
05-839-00132-1KT
In Stock at Vendor
$1599.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Cat-Back Exhaust System - Resonated

ES#2827260 - SSXAU046 - Cat-Back Exhaust System - Resonated - 2.25" stainless steel with quad 76.2mm polished tips - Milltek Sport - Audi

2.25" stainless steel with quad 76.2mm polished tips Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply

Brand:
Milltek Sport - Corporate Logo
ES#:
2827260
Mfg#:
SSXAU046
Ships on Nov 18, 2026
ON SALE! SAVE 10%
$1776.99

This product was last offered at the strikethrough price on
10-26-2026

$1598.58 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Audi B9 S4 Tunnel Street Shield Aluminum Skid Plate

ES#3610310 - 023781ecs02KT - Audi B9 S4 Tunnel Street Shield Aluminum Skid Plate - Protect your vehicle's tunnel and improve aerodynamics - ECS - Audi

Protect your vehicle's tunnel and improve aerodynamics 10X Entries Into Our F80 M3 Sweepstakes Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply

Brand:
ECS - Corporate Logo
ES#:
3610310
Mfg#:
023781ECS02KT
Ships on Feb 11, 2027
ON SALE! SAVE 10%
$354.99

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

$319.49 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Timing Belt Kit - Ultimate With Cam Locking Tool

ES#7440 - 078198671 - Timing Belt Kit - Ultimate With Cam Locking Tool - Complete kit to service your timing belt, water pump, and thermostat - Assembled By ECS - Audi

Complete kit to service your timing belt, water pump, and thermostat 10X Entries Into Our F80 M3 Sweepstakes Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply

Brand:
Assembled By ECS - Corporate Logo
ES#:
7440
Mfg#:
078198671
Ships in 10 Business Days
ON SALE! SAVE 18%
$485.99

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

$399.14 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Audi B9 S4/S5 3.0T Kohlefaser Luft-Technik Intake System

ES#3545247 - 023796ECS04 - Audi B9 S4/S5 3.0T Kohlefaser Luft-Technik Intake System - Enhance your engine's performance with gains up to 16 Wheel Horsepower and 15 foot pounds of torque with our ECS Carbon Fiber Cold Air Intake - ECS - Audi

Enhance your engine's performance with gains up to 16 Wheel Horsepower and 15 foot pounds of torque with our ECS Carbon Fiber Cold Air Intake 10X Entries Into Our F80 M3 Sweepstakes Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply

Brand:
ECS - Corporate Logo
ES#:
3545247
Mfg#:
023796ECS04
In Stock
ON SALE! SAVE 20%
$998.99

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

$796.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

RacingLine Higher Output Ignition Coil - Red - Priced Each

ES#4846419 - VWR900003 - RacingLine Higher Output Ignition Coil - Red - Priced Each - Delivers greater energy output, ensuring a stronger and more consistent spark. A simple plug-and-play upgrade over the OE factory coils. - Racingline - Audi Volkswagen

Delivers greater energy output, ensuring a stronger and more consistent spark. A simple plug-and-play upgrade over the OE factory coils. Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply

Brand:
Racingline - Corporate Logo
ES#:
4846419
Mfg#:
VWR900003
Ships in 9 Business Days
ON SALE! SAVE 11%
$39.99

This product was last offered at the strikethrough price on
10-26-2026

$35.41 USD
Free Shipping
on orders $49 and up

Gas Cap With Strap

ES#2084494 - 4F0201550J - Gas Cap With Strap - Replace your leaking cap, or the one you left at the pump - Genuine Volkswagen Audi - Audi

Replace your leaking cap, or the one you left at the pump Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply
For sedan/avant models only

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
2084494
Mfg#:
4F0201550J
In Stock
11% off MSRP

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

$71.66

This product was last offered at the strikethrough price on
05-07-2026

$63.71 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

expansion tank pipe

ES#2556704 - 8K0121081BK - expansion tank pipe - Connects the expansion tank to the hard water pipes and the small upper radiator port - Genuine Volkswagen Audi - Audi

Connects the expansion tank to the hard water pipes and the small upper radiator port Earn 5% back in ECS Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply
From production date 4/9/2012

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
2556704
Mfg#:
8K0121081BK
Ships in 1-2 days
10% off MSRP

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

$219.99

This product was last offered at the strikethrough price on
10-26-2026

$198.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

More About Engine Parts & Accessories

Whether you're maintaining or repairing your stock engine or looking for added horsepower, we have one of the most comprehensive inventories of engine parts and accessories for German cars. From hard engine parts like connecting rods, pistons, cylinder heads, short blocks, and engine timing parts to performance engine software upgrades; we have you covered.

Let us help you find the parts that fit your Audi

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Manufacturer names and/or part numbers are used only for identification purposes.

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