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Audi B9 S4 Quattro 3.0T Essential Performance Parts & Upgrades

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Audi B9 S4/S5 Sportback 3.0T Valved Exhaust System

ES#4369839 - 026018ECS - Audi B9 S4/S5 Sportback 3.0T Valved Exhaust System - ECS evolutionary design and manufacturing, blending with raw emotion, desire and passion, creating a truly unique driving experience - ECS - Audi

ECS evolutionary design and manufacturing, blending with raw emotion, desire and passion, creating a truly unique driving experience 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
ECS - Corporate Logo
ES#:
4369839
Mfg#:
026018ECS
Ships on Oct 29, 2026
ON SALE!
Starting at $1471.77 USD
Customize
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Carbon Fiber ECU Cover - Audi B9 S4/S5/RS5

ES#3247906 - 024249ECS01 - Carbon Fiber ECU Cover - Audi B9 S4/S5/RS5 - Compliment your engine bay and hide away the exposed ECU - ECS - Audi

Compliment your engine bay and hide away the exposed ECU 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
ECS - Corporate Logo
ES#:
3247906
Mfg#:
024249ECS01
In Stock
ON SALE! SAVE 20%
$239.99

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

$191.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Audi B9 A4/S4/A5 Engine Street Shield Aluminum Skid Plate

ES#3411957 - 019207ecs01KT - Audi B9 A4/S4/A5 Engine Street Shield Aluminum Skid Plate - Protect your vehicle's plastic oil pan with this 4mm thick aluminum skid plate - ECS - Audi

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

Brand:
ECS - Corporate Logo
ES#:
3411957
Mfg#:
019207ECS01KT
In Stock
$391.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

B9 A4 / S4 Lowering Spring Set

ES#4714528 - 051204LA01-A - B9 A4 / S4 Lowering Spring Set - Dramatically improve looks and handling with and average lowering up to 1.5" front and rear. - ECS - Audi

Dramatically improve looks and handling with and average lowering up to 1.5" front and rear. 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
ECS - Corporate Logo
ES#:
4714528
Mfg#:
051204LA01-A
In Stock
ON SALE! SAVE 10%
$315.99

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

$284.39 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Audi B9 A4/S4 Transmission Street Shield Aluminum Skid Plate

ES#3979295 - 027567ecs01KT - Audi B9 A4/S4 Transmission Street Shield Aluminum Skid Plate - Protect your transmission pan and improve aerodynamics - ECS - Audi

Protect your transmission pan and improve aerodynamics 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
ECS - Corporate Logo
ES#:
3979295
Mfg#:
027567ECS01KT
In Stock
ON SALE! SAVE 15%
$354.99

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

$301.74 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Audi B9 Carbon Fiber Engine Cover Overlay Kit

ES#3969803 - 023897ECS02 - Audi B9 Carbon Fiber Engine Cover Overlay Kit - Add a touch of carbon fiber to your stock engine cover! - ECS - Audi

Add a touch of carbon fiber to your stock engine cover! 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
ECS - Corporate Logo
ES#:
3969803
Mfg#:
023897ECS02
In Stock
ON SALE! SAVE 10%
$366.99

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

$330.29 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

ECS Tuning Ultimate Audi B9 Street Shield Kit

ES#3612458 - 019207ecs01KT5 - ECS Tuning Ultimate Audi B9 Street Shield Kit - Get the ultimate under body protection for your B9! - ECS - Audi

Get the ultimate under body protection for your B9! 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
ECS - Corporate Logo
ES#:
3612458
Mfg#:
019207ECS01KT5
In Stock
ON SALE!
$1045.99

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

$1014.61 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

ECS Tuning Exhaust Resonator Delete Section

ES#4848336 - 008553ECS12-01 - ECS Tuning Exhaust Resonator Delete Section - Change out your ECS Tuning B8/8.5 S4/S5 or B9 A4/S4 Valved Exhaust from resonated to non-resonated! - ECS - Audi

Change out your ECS Tuning B8/8.5 S4/S5 or B9 A4/S4 Valved Exhaust from resonated to non-resonated! 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
ECS - Corporate Logo
ES#:
4848336
Mfg#:
008553ECS12-01
In Stock
ON SALE! SAVE 10%
$91.99

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

$82.79 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Audi B9 S4/S5 ECU Cover - Matte Black

ES#3740044 - 028798ECS01 - Audi B9 S4/S5 ECU Cover - Matte Black - Compliment your engine bay and hide away the exposed ECU - ECS - Audi

Compliment your engine bay and hide away the exposed ECU 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
ECS - Corporate Logo
ES#:
3740044
Mfg#:
028798ECS01
In Stock
ON SALE! SAVE 25%
$103.99

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

$77.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Audi B9 Carbon Fiber Antenna Cover

ES#3468626 - 024985ECS01 - Audi B9 Carbon Fiber Antenna Cover - Add a unique, lightweight look to your B9 - ECS - Audi

Add a unique, lightweight look to your B9 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
ECS - Corporate Logo
ES#:
3468626
Mfg#:
024985ECS01
In Stock
ON SALE! SAVE 20%
$100.99

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

$80.79 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Audi B9 S4/S5 Sportback 3.0T Valved Exhaust System & Luft-Technik Intake System

ES#4751050 - 026018ECSEBKT - Audi B9 S4/S5 Sportback 3.0T Valved Exhaust System & Luft-Technik Intake System - Improve the sound and performance of your vehicle with a valved catback & Luft-Technik Intake System - Enthusiast Bundles - Audi

Improve the sound and performance of your vehicle with a valved catback & Luft-Technik Intake System Don't See A Bundle You Want - Give Us A Call Or Chat - We Will Make One!

Brand:
Enthusiast Bundles - Corporate Logo
ES#:
4751050
Mfg#:
026018ECSEBKT
Ships on Oct 29, 2026
Auto Notify
ON SALE! SAVE 23%
$3293.99

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

$2549.99 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 For Our 25th Anniversary Sweepstakes!

Brand:
ECS - Corporate Logo
ES#:
3610310
Mfg#:
023781ECS02KT
In Stock
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

Engine Street Shield Hardware Kit

ES#3468577 - 019207ECS02KT - Engine Street Shield Hardware Kit - Replacement hardware kit for your front location ECS Street Shield - ECS - Audi

Replacement hardware kit for your front location ECS Street Shield 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
ECS - Corporate Logo
ES#:
3468577
Mfg#:
019207ECS02KT
In Stock
ON SALE! SAVE 10%
$90.99

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

$81.59 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Carbon Fiber Engine Cover

ES#4265528 - 034-1ZZ-1004 - Carbon Fiber Engine Cover - Designed to tastefully complement the factory engine bay with a beautiful carbon fiber weave that is perfectly matched to the X34 Carbon Fiber Air Intake. - 034Motorsport - Audi

Designed to tastefully complement the factory engine bay with a beautiful carbon fiber weave that is perfectly matched to the X34 Carbon Fiber Air Intake. For vehicles up through the 2019 model year only

Brand:
034Motorsport - Corporate Logo
ES#:
4265528
Mfg#:
034-1ZZ-1004
Ships in 2 Business Days
ON SALE! SAVE 10%
$461.00

This product was last offered at the strikethrough price on
08-17-2026

$414.90 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Audi B9 Engine Bay Block Off Plugs - Set

ES#3667767 - 026829ECS01 - Audi B9 Engine Bay Block Off Plugs - Set - Keep your engine bay clean and pristine! - ECS - Audi

Keep your engine bay clean and pristine! 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
ECS - Corporate Logo
ES#:
3667767
Mfg#:
026829ECS01
In Stock
ON SALE! SAVE 89%
$45.99

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

$4.88 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Front Strut Tower Cover Kit - Left

ES#4783266 - 8w0806583cKT - Front Strut Tower Cover Kit - Left - Keep your engine bay clean and looking good! - Genuine Volkswagen Audi - Audi

Keep your engine bay clean and looking good!

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
4783266
Mfg#:
8W0806583CKT
Ships in 2 Business Days
$40.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

More About Essential Performance Parts & Upgrades

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