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Audi A4 Performance Parts & Upgrades

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Performance Valve Spring/Retainer Kit

ES#2794008 - IEVTVC3 - Performance Valve Spring/Retainer Kit - High quality performance valve springs and titanium retainers - Integrated Engineering - Audi Volkswagen

High quality performance valve springs and titanium retainers 5X Entries For Our 25th Anniversary Sweepstakes!

Brand:
Integrated Engineering - Corporate Logo
ES#:
2794008
Mfg#:
IEVTVC3
In Stock
$663.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Performance High-Flow Air Intake System - 6" Velocity Stack

ES#4045629 - CTS-IT-290R - Performance High-Flow Air Intake System - 6" Velocity Stack - Designed to work in conjunction with the OEM air scoop to seamlessly force cold air into the system - Flowed through a massive 6" velocity stack filter! - CTS - Audi

Designed to work in conjunction with the OEM air scoop to seamlessly force cold air into the system - Flowed through a massive 6" velocity stack filter!

Brand:
CTS - Corporate Logo
ES#:
4045629
Mfg#:
CTS-IT-290R
Back Ordered
Auto Notify
ON SALE! SAVE 15%
$299.99

This product was last offered at the strikethrough price on
07-10-2026

$254.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

IE Recirculating Catch Can Kit

ES#2794717 - IEBACG1 - IE Recirculating Catch Can Kit - Prevent crankcase oil fumes from condensing and filling your turbo piping, intercooler, and intake manifold - Integrated Engineering - Audi

Prevent crankcase oil fumes from condensing and filling your turbo piping, intercooler, and intake manifold 5X Entries For Our 25th Anniversary Sweepstakes!

For models with plastic intake manifold only

Brand:
Integrated Engineering - Corporate Logo
ES#:
2794717
Mfg#:
IEBACG1
Back Ordered
Auto Notify
$591.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Audi B8.5 S4 / A4 S-Line Carbon Fiber Rear Diffuser

ES#3085916 - 018359ECS01A - Audi B8.5 S4 / A4 S-Line Carbon Fiber Rear Diffuser - Hand-laid carbon fiber to upgrade your exterior styling - ECS - Audi

Hand-laid carbon fiber to upgrade your exterior styling 10X Entries For Our 25th Anniversary Sweepstakes!

Fits S-Line bumpers from the 2013 model year

Brand:
ECS - Corporate Logo
ES#:
3085916
Mfg#:
018359ECS01A
In Stock
ON SALE! SAVE 10%
$1019.99

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

$917.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Transmission Mount Bushing Insert Kit

ES#3023205 - 009860ECS01 - Transmission Mount Bushing Insert Kit - Decrease transmission mount slop for better drivetrain response! - ECS - Audi Porsche

Decrease transmission mount slop for better drivetrain response! 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
ECS - Corporate Logo
ES#:
3023205
Mfg#:
009860ECS01
In Stock
ON SALE! SAVE 25%
$101.99

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

$76.49 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Harmonic Damper Crankshaft Pulley

ES#2966553 - 551231 - Harmonic Damper Crankshaft Pulley - Provides broad range control of destructive crankshaft torsional vibration for optimum horsepower and durability - Fluidampr - Audi Volkswagen

Provides broad range control of destructive crankshaft torsional vibration for optimum horsepower and durability

Brand:
Fluidampr - Corporate Logo
ES#:
2966553
Mfg#:
551231
In Stock
$517.60 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

B8 A4 / A5 2.0T Performance Aluminum Radiator

ES#4566538 - 012463LA01 - B8 A4 / A5 2.0T Performance Aluminum Radiator - Direct-fit upgrade! Featuring an 80% increase in core thickness and durable, all-aluminum construction. - ECS - Audi

Direct-fit upgrade! Featuring an 80% increase in core thickness and durable, all-aluminum construction. 10X Entries For Our 25th Anniversary Sweepstakes!
10X Entries For Our Spin To Win Sweepstakes!
For Vehicles Equipped with an Automatic Transmission

Brand:
ECS - Corporate Logo
ES#:
4566538
Mfg#:
012463LA01
In Stock
ON SALE! SAVE 20%
$428.99

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

$343.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Billet Aluminum Oil Filter Housing Kit - Silver Anodized

ES#2723776 - 003602ECS01A01A - Billet Aluminum Oil Filter Housing Kit - Silver Anodized - Aluminum oil filter housing replacement for plastic OE housing - ECS - Audi Volkswagen

Aluminum oil filter housing replacement for plastic OE housing 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
ECS - Corporate Logo
ES#:
2723776
Mfg#:
003602ECS01A01A
In Stock
ON SALE! SAVE 15%
$144.99

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

$123.24 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

550cc Fuel Injectors - Set Of Four

ES#1899400 - injb550 - 550cc Fuel Injectors - Set Of Four - Compatible with BT software applications. Includes injector plug adapters - Bosch - Audi Volkswagen MINI

Compatible with BT software applications. Includes injector plug adapters 2X Entries For Our 25th Anniversary Sweepstakes!
We Price Match - Give Us A Call or Chat!

Brand:
Bosch - Corporate Logo
ES#:
1899400
Mfg#:
INJB550
Ships in 9 Business Days
$437.99

This product was last offered at the strikethrough price on
07-06-2026

$363.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Bilstein B16 DampTronic Suspension System

ES#4390702 - 49-290868 - Bilstein B16 DampTronic Suspension System - Features ride height adjustability with dampers compatible with OE electronic damping systems. - Bilstein - Audi

Features ride height adjustability with dampers compatible with OE electronic damping systems. 2X Entries For Our 25th Anniversary Sweepstakes!
For vehicles with production date from 7/12/2016 with 53mm front strut body

Brand:
Bilstein - Corporate Logo
ES#:
4390702
Mfg#:
49-290868
Back Ordered
Auto Notify
31% off MSRP

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

$3611.00

This product was last offered at the strikethrough price on
07-21-2026

$2499.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Audi B8.5 A4 Trunk Spoiler - Gloss Black

ES#4029429 - 029252ECS01 - Audi B8.5 A4 Trunk Spoiler - Gloss Black - Add some aggressive styling to your Audi! - ECS - Audi

Add some aggressive styling to your Audi! 10X Entries For Our 25th Anniversary Sweepstakes!

For vehicles without an integrated trunk spoiler from the 2013 model year

Brand:
ECS - Corporate Logo
ES#:
4029429
Mfg#:
029252ECS01
In Stock
ON SALE! SAVE 20%
$216.99

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

$173.59 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Wheel Spacer & Bolt Kit - 20mm With Black Conical Seat Bolts

ES#2748292 - 6-ECS-024 - Wheel Spacer & Bolt Kit - 20mm With Black Conical Seat Bolts - Complete kit for two wheels, comes with everything you need to install spacers on your aftermarket wheels - ECS - Audi

Complete kit for two wheels, comes with everything you need to install spacers on your aftermarket wheels 10X Entries For Our 25th Anniversary Sweepstakes!
Fits most aftermarket wheels that use conical seat wheel bolts

Brand:
ECS - Corporate Logo
ES#:
2748292
Mfg#:
6-ECS-024
In Stock
ON SALE! SAVE 10%
$187.99

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

$169.19 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Street Performance Coilover System

ES#3187951 - 50356 - Street Performance Coilover System - Finally, A performance coilover suspension system for your B9 Audi - Offering unrivaled comfort and performance! - H&R - Audi

Finally, A performance coilover suspension system for your B9 Audi - Offering unrivaled comfort and performance! 10X Entries For Our 25th Anniversary Sweepstakes!
We Price Match - Give Us A Call or Chat!
For vehicles without Sport Suspension or Magnetic Ride Control

Brand:
H&R - Corporate Logo
ES#:
3187951
Mfg#:
50356
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.

$1980.00

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

$1782.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

VW/Audi Atmospheric Diverter Valve Spacer - Clear

ES#3551284 - 021828ECS01-02 - VW/Audi Atmospheric Diverter Valve Spacer - Clear - Let your turbo blow off some air for an exhilarating driving experience! - ECS - Audi Volkswagen

Let your turbo blow off some air for an exhilarating driving experience! 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
ECS - Corporate Logo
ES#:
3551284
Mfg#:
021828ECS01-02
In Stock
ON SALE! SAVE 46%
$91.99

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

$49.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

034Motorsport Dynamic+ Sway Bar Kit

ES#4643528 - 034-402-1035 - 034Motorsport Dynamic+ Sway Bar Kit - Designed to reduce body roll, improve turn-in, reduce understeer and enhance steering feel - 034Motorsport - Audi

Designed to reduce body roll, improve turn-in, reduce understeer and enhance steering feel

Brand:
034Motorsport - Corporate Logo
ES#:
4643528
Mfg#:
034-402-1035
In Stock
$717.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

More About Performance Parts & Upgrades

All the performance upgrade options from the best brands in the business to help build your dreams. Our performance parts catalog is the largest anywhere and constantly growing to keep your build on track.

Let us help you find the parts that fit your Audi

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