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Audi A4 Performance Parts & Upgrades

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Complete Rear Differential Mount Kit

ES#3172515 - 018327ecs01KT - Complete Rear Differential Mount Kit - Includes the ECS Rear Differential Mount and Carrier Mount Inserts! - ECS - Audi

Includes the ECS Rear Differential Mount and Carrier Mount Inserts! 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
ECS - Corporate Logo
ES#:
3172515
Mfg#:
018327ECS01KT
Ships on Aug 17, 2026
Auto Notify
ON SALE! SAVE 15%
$385.99

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

$328.09 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

ECS Wheel Spacers - 8mm (Pair)

ES#2167465 - 002411ECS01A08KT - ECS Wheel Spacers - 8mm (Pair) - Add some flair to your car with our new wheel spacers - ECS - Audi BMW Porsche

Add some flair to your car with our new wheel spacers 10X Entries For Our 25th Anniversary Sweepstakes!

Designed to be used with aftermarket wheels

Brand:
ECS - Corporate Logo
ES#:
2167465
Mfg#:
002411ECS01A08KT
In Stock
ON SALE!
$95.99

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

$91.19 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

7.5mm Wheel Spacers - Black (Pair)

ES#3476425 - 021460TMS02-06 - 7.5mm Wheel Spacers - Black (Pair) - Lightweight wheel spacers with a machined tab for easy removal - Turner Motorsport - Audi BMW Mercedes Benz MINI Porsche

Lightweight wheel spacers with a machined tab for easy removal 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
Turner Motorsport - Corporate Logo
ES#:
3476425
Mfg#:
021460TMS02-06
In Stock
ON SALE! SAVE 25%
$131.99

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

$98.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

KW V2 Series Coilover Kit

ES#2092106 - 15210032 - KW V2 Series Coilover Kit - Variant 2 coilovers offer sport handling with adjustable rebound dampening - KW Suspension - Audi

Variant 2 coilovers offer sport handling with adjustable rebound dampening Range of lowering is 1.5-2.9" in the front and rear.

Brand:
KW Suspension - Corporate Logo
ES#:
2092106
Mfg#:
15210032
Back Ordered
$2264.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Rear USR Series Sport Slotted Rotors - Pair (330x22)

ES#2621352 - USR1846 - Rear USR Series Sport Slotted Rotors - Pair (330x22) - Upgrade to a Turbo slotted rotor for improved braking - EBC - Audi

Upgrade to a Turbo slotted rotor for improved braking 2X Entries For Our 25th Anniversary Sweepstakes!

Brand:
EBC - Corporate Logo
ES#:
2621352
Mfg#:
USR1846
In Stock
5% off MSRP

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

$396.99

This product was last offered at the strikethrough price on
07-26-2026

$376.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

1.8T/2.0T Gen3 Diverter Valve Upgrade - Black

ES#4839642 - 013907LA01-03KT - 1.8T/2.0T Gen3 Diverter Valve Upgrade - Black - The LAST diverter valve you'll ever need! Billet aluminum construction and heavy-duty Viton o-rings make for the ultimate upgrade in longevity and performance. - ECS - Audi Volkswagen Porsche

The LAST diverter valve you'll ever need! Billet aluminum construction and heavy-duty Viton o-rings make for the ultimate upgrade in longevity and performance. 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
ECS - Corporate Logo
ES#:
4839642
Mfg#:
013907LA01-03KT
Back Ordered
ON SALE! SAVE 25%
$333.99

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

$250.49 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Density Line Front Upper Strut Mount - Pair

ES#3622332 - 034-601-1002-tKT - Density Line Front Upper Strut Mount - Pair - Approximately twice as stiff as stock, for increased firmness and vehicle control - 034Motorsport - Audi

Approximately twice as stiff as stock, for increased firmness and vehicle control

Brand:
034Motorsport - Corporate Logo
ES#:
3622332
Mfg#:
034-601-1002-TKT
In Stock
$90.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Front Big Brake Kit - Stage 2 - Slotted Rotors (345x30)

ES#3537755 - 025997ECS0624KT - Front Big Brake Kit - Stage 2 - Slotted Rotors (345x30) - Upgrade your brake system to the 4-piston Brembo Q5 calipers. Features ECS V5 brake rotors. - ECS - Audi

Upgrade your brake system to the 4-piston Brembo Q5 calipers. Features ECS V5 brake rotors. 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
ECS - Corporate Logo
ES#:
3537755
Mfg#:
025997ECS0624KT
Ships in 3 Business Days
$2247.99 USD
Free Shipping
This product is lifetime replacement eligible Partial Replacement

V1 Series Coilover Kit

ES#3979096 - 102100BM - V1 Series Coilover Kit - Variant 1 coilovers offer the best balance between sporty driving and comfort - KW Suspension - Audi

Variant 1 coilovers offer the best balance between sporty driving and comfort For models without factory Electronic Damping Control - For models with 48.5mm front strut body. Range of lowering is 1.2-2.2" in the front and 1.4-2.4" in the rear.

Brand:
KW Suspension - Corporate Logo
ES#:
3979096
Mfg#:
102100BM
Back Ordered
$2244.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

V1 Series Coilover Kit

ES#3979094 - 102100bh - V1 Series Coilover Kit - Variant 1 coilovers offer the best balance between sporty driving and comfort - KW Suspension - Audi

Variant 1 coilovers offer the best balance between sporty driving and comfort For models without factory Electronic Damping Control - For models with 50mm front strut body. Range of lowering is 1.2-2.2" in the front and 1.4-2.4" in the rear.

Brand:
KW Suspension - Corporate Logo
ES#:
3979094
Mfg#:
102100BH
Back Ordered
$2244.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Clutch Masters FX400 Clutch Kit & Single Mass Flywheel

ES#3979038 - 02390-HDCL-SK - Clutch Masters FX400 Clutch Kit & Single Mass Flywheel - Features a Heavy duty pressure plate, Full-face ceramic lined sprung clutch disc, and a Steel Single Mass Flywheel - Clutch Masters - Audi

Features a Heavy duty pressure plate, Full-face ceramic lined sprung clutch disc, and a Steel Single Mass Flywheel

Brand:
Clutch Masters - Corporate Logo
ES#:
3979038
Mfg#:
02390-HDCL-SK
Ships in 8 Business Days
$2237.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Carbon Fiber Engine Cover Overlay

ES#3426555 - 022526ecs01KT - Carbon Fiber Engine Cover Overlay - 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!

For vehicles with production dates up to 03/22/2021

Brand:
ECS - Corporate Logo
ES#:
3426555
Mfg#:
022526ECS01KT
In Stock
ON SALE! SAVE 15%
$262.99

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

$223.54 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Forged Narrow Superlite 6R Front Brake Kit - 12.88"

ES#3701618 - 140-14487-R - Forged Narrow Superlite 6R Front Brake Kit - 12.88" - Featuring red 6R six piston caliper and 12.88" GT slotted rotors - Delivers the ultimate combination for braking power and style! - Wilwood - Audi

Featuring red 6R six piston caliper and 12.88" GT slotted rotors - Delivers the ultimate combination for braking power and style!

Brand:
Wilwood - Corporate Logo
ES#:
3701618
Mfg#:
140-14487-R
In Stock at Vendor
$2217.99 USD
This product is lifetime replacement eligible Lifetime Replacement

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