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Audi S4 Most Popular Parts

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D1S Premium LED Conversion Kit - Series 2

ES#4875811 - 003452LB04-01 - D1S Premium LED Conversion Kit - Series 2 - Set of 2 24,000lm combined plug and play LED headlight bulbs to replace your tired xenon bulbs - ZiZa - Audi BMW Volkswagen Mercedes Benz MINI

Set of 2 24,000lm combined plug and play LED headlight bulbs to replace your tired xenon bulbs affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
ZiZa - Corporate Logo
ES#:
4875811
Mfg#:
003452LB04-01
In Stock
ON SALE! SAVE 10%
$89.99

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

$80.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

B8 Sport Front Strut Kit

ES#4430366 - 24-145985KT - B8 Sport Front Strut Kit - Give your vehicle a more aggressive feel - Bilstein - Audi

Give your vehicle a more aggressive feel affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

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

Brand:
Bilstein - Corporate Logo
ES#:
4430366
Mfg#:
24-145985KT
Ships on Sep 18, 2026
Auto Notify
$785.99

This product was last offered at the strikethrough price on
05-22-2026

$590.00 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Iridium BKR9EIX Spark Plug - Priced Each

ES#2575952 - BKR9EIX - Iridium BKR9EIX Spark Plug - Priced Each - The NGK Iridium IX offers extreme ignitability, improved throttle response and superior anti fouling properties. - NGK - Audi

The NGK Iridium IX offers extreme ignitability, improved throttle response and superior anti fouling properties. affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
We Price Match - Give Us A Call or Chat!
Recommended to be used by various tuners when paired with performance software - recommended gap of .024” +/- .002”

Brand:
NGK - Corporate Logo
ES#:
2575952
Mfg#:
BKR9EIX
In Stock
$8.03 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

B8 S4 / S5 3.0T Performance Aluminum Radiator

ES#4566542 - 012620LA02 - B8 S4 / S5 3.0T Performance Aluminum Radiator - Direct-fit upgrade! Featuring a 33% increase in core thickness and durable, all-aluminum construction. - ECS - Audi

Direct-fit upgrade! Featuring a 33% increase in core thickness and durable, all-aluminum construction. affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes! USE CODE ECS20 IN CART FOR BEST PRICE
10X Entries For Our Spin To Win Sweepstakes!
For Vehicles Equipped with a Manual Transmission

Brand:
ECS - Corporate Logo
ES#:
4566542
Mfg#:
012620LA02
In Stock
ON SALE! SAVE 39%
$407.99

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

$250.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

B5 A4/S4 Manual - Driveshaft Center Support Bearing Carrier

ES#4609176 - 012158la01kt - B5 A4/S4 Manual - Driveshaft Center Support Bearing Carrier - As our beloved B5's age the stock center support bearing starts to wear out causing drivetrain clunk. This upgraded unit keeps the driveshaft firmly in place at all times and its polyurethane construction ensures it will outlast the squishy rubber bushing - ECS - Audi

As our beloved B5's age the stock center support bearing starts to wear out causing drivetrain clunk. This upgraded unit keeps the driveshaft firmly in place at all times and its polyurethane construction ensures it will outlast the squishy rubber bushing affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes! USE CODE ECS20 IN CART FOR BEST PRICE
Manual Transmission B5 A4/S4

Brand:
ECS - Corporate Logo
ES#:
4609176
Mfg#:
012158LA01KT
In Stock
$302.99 USD
Free Shipping
This product is lifetime replacement eligible Partial Replacement

Audi 2.7T F21 Hybrid Turbochargers

ES#2840951 - f21bt - Audi 2.7T F21 Hybrid Turbochargers - Complete bolt on Turbo upgrade including turbo inlet pipes - FrankenTurbo - Audi

Complete bolt on Turbo upgrade including turbo inlet pipes affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
FrankenTurbo - Corporate Logo
ES#:
2840951
Mfg#:
F21BT
Ships on Jul 29, 2026
$1999.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Purge Control Valve Solenoid Valve

ES#3693642 - 06M133240CG - Purge Control Valve Solenoid Valve - Rear most purge Valve and line with T fitting that connects to the turbo and non-return-valve - Genuine Volkswagen Audi - Audi

Rear most purge Valve and line with T fitting that connects to the turbo and non-return-valve affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
3693642
Mfg#:
06M133240CG
In Stock
2% off MSRP

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

$158.99

This product was last offered at the strikethrough price on
06-12-2026

$155.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Rear Bushing Differential Mount Insert Kit

ES#2992520 - 008288ECS02 - Rear Bushing Differential Mount Insert Kit - Decrease differential slop for better drivetrain response! - ECS - Audi Porsche

Decrease differential slop for better drivetrain response! affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes! USE CODE ECS20 IN CART FOR BEST PRICE

Brand:
ECS - Corporate Logo
ES#:
2992520
Mfg#:
008288ECS02
In Stock
$115.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Ohlins Road And Track Coilovers

ES#3691438 - AUS MS00 - Ohlins Road And Track Coilovers - The hlins Road & Track suspension gives our customers a true racing experience, with their own cars, without losing comfort when commuting to work. - Ohlins - Audi

The Öhlins Road & Track suspension gives our customers a true racing experience, with their own cars, without losing comfort when commuting to work. affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
Ohlins - Corporate Logo
ES#:
3691438
Mfg#:
AUS MS00
In Stock
$3323.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

710N Diverter Valve - Priced Each

ES#2739493 - 06A145710N - 710N Diverter Valve - Priced Each - A great upgrade for stock to mildly tuned engines - Kayser - Audi Volkswagen

A great upgrade for stock to mildly tuned engines affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Two per vehicle

Brand:
Kayser - Corporate Logo
ES#:
2739493
Mfg#:
06A145710N
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.

$46.99

This product was last offered at the strikethrough price on
06-12-2026

$41.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

APR Throttle Booster

ES#4624165 - EM100050 - APR Throttle Booster - Wireless Controller with Blutooth Mobile connectivity - APR - Audi Volkswagen Porsche

Wireless Controller with Blutooth Mobile connectivity Call In Or Chat For Best Price! affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 5X Entries For Our 25th Anniversary Sweepstakes!

Brand:
APR - Corporate Logo
ES#:
4624165
Mfg#:
EM100050
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.

$316.95

This product was last offered at the strikethrough price on
03-13-2026

$280.95 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Density Line Control Arm Kit Upper Adjustable - Camber Correcting

ES#4630175 - 034-401-1071 - Density Line Control Arm Kit Upper Adjustable - Camber Correcting - Add positive camber after lowering to reach factory alignment specifications and reduce tire wear. - 034Motorsport - Audi

Add positive camber after lowering to reach factory alignment specifications and reduce tire wear. affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
034Motorsport - Corporate Logo
ES#:
4630175
Mfg#:
034-401-1071
In Stock
$1226.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Front Door Speaker - Priced Each

ES#461623 - 8T0035415B - Front Door Speaker - Priced Each - Fits the left and right side - Genuine Volkswagen Audi - Audi

Fits the left and right side affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
For vehicles with Bang & Olufsen sound systems

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
461623
Mfg#:
8T0035415B
In Stock
17% off MSRP

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

$141.67

This product was last offered at the strikethrough price on
06-12-2026

$117.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Oil Check Valve Service Kit

ES#2765724 - 079103175CKT - Oil Check Valve Service Kit - Service your oil check valves to ensure your cylinder heads are properly lubricated - Assembled By ECS - Audi

Service your oil check valves to ensure your cylinder heads are properly lubricated affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
Assembled By ECS - Corporate Logo
ES#:
2765724
Mfg#:
079103175CKT
In Stock at Vendor
ON SALE!
$285.99

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

$279.42 USD
Free Shipping
This product is lifetime replacement eligible Partial Replacement

Silicone Heater Core Hose Set

ES#4657004 - 034-102-3071 - Silicone Heater Core Hose Set - Replace your worn and cracked factory heater core hoses with these silicone reproductions of the NLA factory hoses - 034Motorsport - Audi

Replace your worn and cracked factory heater core hoses with these silicone reproductions of the NLA factory hoses affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
034Motorsport - Corporate Logo
ES#:
4657004
Mfg#:
034-102-3071
In Stock
$168.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

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