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Audi S4 Most Popular Parts

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High Flow Inlet Pipe

ES#4420002 - CTS-HW-380 - High Flow Inlet Pipe - The biggest issue with the restrictive factory inlet is apparent when you start to increase the power. CTS engineers designed the turbo inlet to be as large as possible; yet still fit perfectly. - CTS - Audi

The biggest issue with the restrictive factory inlet is apparent when you start to increase the power. CTS engineers designed the turbo inlet to be as large as possible; yet still fit perfectly.

Brand:
CTS - Corporate Logo
ES#:
4420002
Mfg#:
CTS-HW-380
Ships on Nov 24, 2026
ON SALE! SAVE 15%
$99.99

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

$84.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Center Cap - Grey Metallic - Priced Each

ES#7677 - 4B0601170A7ZJ - Center Cap - Grey Metallic - Priced Each - Replace your missing or damaged cap. 56mm - Genuine Volkswagen Audi - Audi

Replace your missing or damaged cap. 56mm

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
7677
Mfg#:
4B0601170A7ZJ
In Stock
8% off MSRP

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

$61.15

This product was last offered at the strikethrough price on
10-30-2026

$56.00 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

K03 Replacement Kit

ES#259912 - S4K03 - K03 Replacement Kit - Restore boost and get going! - Assembled By ECS - Audi

Restore boost and get going! 10X Entries Into Our F80 M3 Sweepstakes

Brand:
Assembled By ECS - Corporate Logo
ES#:
259912
Mfg#:
S4K03
Back Ordered
$2477.00

This product was last offered at the strikethrough price on
08-13-2026

$2458.58 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Front B8 Sport Strut - Priced Each

ES#1005638 - 24-185059 - Front B8 Sport Strut - Priced Each - Give your vehicle a more aggressive feel - Fits left & right side - Bilstein - Audi

Give your vehicle a more aggressive feel - Fits left & right side 10X Entries Into Our F80 M3 Sweepstakes

Brand:
Bilstein - Corporate Logo
ES#:
1005638
Mfg#:
24-185059
In Stock
$189.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Air Filter

ES#1905472 - 8K0133843 - Air Filter - Keep clean air running through your engine - Hengst - Audi
ECS Tuning recommends this product.

Keep clean air running through your engine 5X Entries Into Our F80 M3 Sweepstakes
We Price Match - Give Us A Call or Chat! Hengst is our preferred OEM filtration supplier!

Brand:
Hengst - Corporate Logo
ES#:
1905472
Mfg#:
8K0133843
In Stock
$20.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

A/C Pressure Switch

ES#4057415 - 4H0959126B - A/C Pressure Switch - Prevents excess pressure from building within the system - Original Equipment - Audi

Prevents excess pressure from building within the system

Brand:
Original Equipment - Corporate Logo
ES#:
4057415
Mfg#:
4H0959126B
Back Ordered
$35.99

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

$34.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Mechatronics Repair Kit

ES#4349474 - 0B5398009F - Mechatronics Repair Kit - Includes the valve block wiring, speed sensor with cable, and hardware - Vemo - Audi

Includes the valve block wiring, speed sensor with cable, and hardware For vehicles with 7-speed S-Tronic transmissions

Brand:
Vemo - Corporate Logo
ES#:
4349474
Mfg#:
0B5398009F
In Stock
$611.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

NRG Short Hub Adapter

ES#4415853 - SRK-183H - NRG Short Hub Adapter - This hub was designed with the NRG quick release in mind - NRG - Audi Volkswagen Porsche

This hub was designed with the NRG quick release in mind

Brand:
NRG - Corporate Logo
ES#:
4415853
Mfg#:
SRK-183H
Back Ordered
$188.00 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Radiator Hose - Upper

ES#3448378 - 8E0121070B - Radiator Hose - Upper - Includes quick disconnect piece - Feed Hose - Rein - Audi

Includes quick disconnect piece - Feed Hose 2X Entries Into Our F80 M3 Sweepstakes
We Price Match - Give Us A Call or Chat!

Brand:
Rein - Corporate Logo
ES#:
3448378
Mfg#:
8E0121070B
In Stock
$110.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

72.6-57.1 Hub Centric Rings - Set Of Four

ES#2185347 - AP726571 - 72.6-57.1 Hub Centric Rings - Set Of Four - Plastic 72.6mm to 57.1mm hub centric rings for proper wheel fitment - ECS - Audi BMW Volkswagen

Plastic 72.6mm to 57.1mm hub centric rings for proper wheel fitment 10X Entries Into Our F80 M3 Sweepstakes

Brand:
ECS - Corporate Logo
ES#:
2185347
Mfg#:
AP726571
In Stock
ON SALE! SAVE 25%
$30.99

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

$23.24 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

B5 Quattro Rear Wheel Bearing Service Kit

ES#3188120 - 000576SCH01AKT - B5 Quattro Rear Wheel Bearing Service Kit - Includes Schwaben service tool, wheel bearings, and hardware to conveniently replace both rear wheel bearings on your B5 quattro - Assembled By ECS - Audi

Includes Schwaben service tool, wheel bearings, and hardware to conveniently replace both rear wheel bearings on your B5 quattro 10X Entries Into Our F80 M3 Sweepstakes

Brand:
Assembled By ECS - Corporate Logo
ES#:
3188120
Mfg#:
000576SCH01AKT
In Stock
ON SALE!
$269.98 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Forged H-Beam Connecting Rods

ES#2794230 - IERHVD1 - Forged H-Beam Connecting Rods - Set of 6 - Integrated Engineering - Audi

Set of 6

Brand:
Integrated Engineering - Corporate Logo
ES#:
2794230
Mfg#:
IERHVD1
Back Ordered
$808.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

AERO6 Front Big Brake Kit - 14.00"

Featuring red Aero6 six piston caliper and 14.00" drilled & slotted rotors - Delivers the ultimate combination for braking power and style! *18 inch minimum wheel diameter*

Brand:
Wilwood - Corporate Logo
ES#:
3701658
Mfg#:
140-14584-DR
Ships in 10 Business Days
$2425.99 USD
This product is lifetime replacement eligible Lifetime Replacement

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