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Audi A4 Performance Parts & Upgrades

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ES#4045950 - B6B7RearLSDMT - JHM Helical Rear Limited Slip Differential - Helical gears respond to changes in traction conditions very quickly - Improves traction and predictability of vehicle behavior: both rear wheels will spin at the same rate. - JH Motorsports  - Audi

Helical gears respond to changes in traction conditions very quickly - Improves traction and predictability of vehicle behavior: both rear wheels will spin at the same rate. *Fitment confirmed in ETS, EXZ, & ETQ diff codes - Does not fit in some 2007+ differential cases - Please see fitment notes in product description for co

Brand:
JH Motorsports  - Corporate Logo
ES#:
4045950
Mfg#:
B6B7REARLSDMT
Ships on Nov 23, 2026
$949.99 USD
Free Shipping
on orders $49 and up
ES#4017053 - B9A4PWRPK - Build Your Own Power Package - Audi B9 A4 2.0T - Go from mild to wild! Select the options you want for your build. - Assembled By ECS - Audi

Go from mild to wild! Select the options you want for your build. 10X Entries Into Our F80 M3 Sweepstakes

Brand:
Assembled By ECS - Corporate Logo
ES#:
4017053
Mfg#:
B9A4PWRPK
Back Ordered
Starting at $0.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement
ES#2918090 - SSXAU514 - B7 A4 2.0T Cat-Back Exhaust System - Resonated - 2.5" stainless steel with dual GT 100mm polished tips - Milltek Sport - Audi

2.5" stainless steel with dual GT 100mm polished tips Manual transmission only

Brand:
Milltek Sport - Corporate Logo
ES#:
2918090
Mfg#:
SSXAU514
Ships on Nov 30, 2026
$1897.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement
ES#3493177 - 003251ECS02KT - Engine Street Shield Skid Plate Hardware Kit - Replacement hardware kit for your ECS Engine Street Shield - ECS - Audi

Replacement hardware kit for your ECS Engine Street Shield 10X Entries Into Our F80 M3 Sweepstakes
Fits from the 2013 model year

Brand:
ECS - Corporate Logo
ES#:
3493177
Mfg#:
003251ECS02KT
In Stock
$140.53 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement
ES#3365 - 058145703KO4WGKT - K04 0015 Turbocharger With Installation Kit - Great bolt on performance upgrade that can be used with or without specific programming - Assembled By ECS - Audi Volkswagen

Great bolt on performance upgrade that can be used with or without specific programming 10X Entries Into Our F80 M3 Sweepstakes

Brand:
Assembled By ECS - Corporate Logo
ES#:
3365
Mfg#:
058145703KO4WGKT
Back Ordered
$1938.99

This product was last offered at the strikethrough price on
08-25-2026

$1893.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement
ES#4069832 - CTSFPK004 - CTS Turbo Stage 3 Fuel Pump Kit - Walbro 525 - Fuel pump system to support all the power that your engine can handle! - CTS - Audi Volkswagen

Fuel pump system to support all the power that your engine can handle!

Brand:
CTS - Corporate Logo
ES#:
4069832
Mfg#:
CTSFPK004
Ships in 8 Business Days
ON SALE! SAVE 15%
$444.99

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

$378.24 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement
ES#2876924 - 034-601-1002-TD - Density Line Front Upper Strut Mount - Priced Each - 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 2X Entries Into Our F80 M3 Sweepstakes

Brand:
034Motorsport - Corporate Logo
ES#:
2876924
Mfg#:
034-601-1002-TD
In Stock
$45.00 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement
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 2X Entries Into Our F80 M3 Sweepstakes

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
ES#3972077 - 78670 - Rear Performance Air Ride Kit  - Allow your B9 Audi to sit on the ground! - Air Lift - Audi

Allow your B9 Audi to sit on the ground!

Brand:
Air Lift - Corporate Logo
ES#:
3972077
Mfg#:
78670
Ships in 5 Business Days
$1889.99 USD
This product is lifetime replacement eligible Lifetime Replacement
ES#4476369 - B9FLUSH1KT - 19" Wheel Spacer Flush Fit Kit - Black Bolts - Includes H&R spacers & Black bolts to obtain a flush look on your OE 19" wheels - Assembled By ECS - Audi

Includes H&R spacers & Black bolts to obtain a flush look on your OE 19" wheels 10X Entries Into Our F80 M3 Sweepstakes

Brand:
Assembled By ECS - Corporate Logo
ES#:
4476369
Mfg#:
B9FLUSH1KT
Back Ordered
ON SALE!
$290.99

This product was last offered at the strikethrough price on
07-01-2026

$269.49 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement
ES#348 - 50556651 - DRA Series Wheel Spacers - 25mm (1 Pair) - Want to add some stance to your car with those new wheels? Get these new spacers today - H&R - Audi Mercedes Benz Porsche

Want to add some stance to your car with those new wheels? Get these new spacers today We Price Match - Give Us A Call or Chat!

Brand:
H&R - Corporate Logo
ES#:
348
Mfg#:
50556651
In Stock
10% off MSRP

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

$189.99

This product was last offered at the strikethrough price on
10-01-2026

$170.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement
ES#3141743 - 034-401-1009 - Density Line Adjustable Upper Control Arm Kit - Track Spec - Track Spec: Perfect for those who are low, and looking for even more negative camber for better track performance. - 034Motorsport - Audi Porsche

Track Spec: Perfect for those who are low, and looking for even more negative camber for better track performance. 2X Entries Into Our F80 M3 Sweepstakes

Brand:
034Motorsport - Corporate Logo
ES#:
3141743
Mfg#:
034-401-1009
Ships in 3 Business Days
$626.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement
ES#2827275 - SSXAU089 - Cat-Back Exhaust System - Resonated - 2.5" stainless steel with dual 100mm polished tips - Milltek Sport - Audi

2.5" stainless steel with dual 100mm polished tips Fits 5 speed manual only

Brand:
Milltek Sport - Corporate Logo
ES#:
2827275
Mfg#:
SSXAU089
Ships on Nov 30, 2026
$1875.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

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