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Audi A4 Performance Parts & Upgrades

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IE Front Sway Bar Upgrade

ES#5375237 - IESSCK3 - IE Front Sway Bar Upgrade - Direct bolt-in replacement with adjustable stiffness for reduced body roll and increased grip! - Integrated Engineering - Audi

Direct bolt-in replacement with adjustable stiffness for reduced body roll and increased grip! 5X Entries For Our 25th Anniversary Sweepstakes!
This front sway bar must be paired with the matching iE Rear Sway Bar (IESSCK1)

Brand:
Integrated Engineering - Corporate Logo
ES#:
5375237
Mfg#:
IESSCK3
Ships in 1 Business Day
$339.99 USD
This product is lifetime replacement eligible Lifetime Replacement

Stage 1 Clutch Kit

ES#2570169 - SA5913 - Stage 1 Clutch Kit - Improved holding power over your OEM clutch disc & pressure plate - Spec Clutches - Audi

Improved holding power over your OEM clutch disc & pressure plate For use with OEM dual-mass flywheel or Spec billet flywheel designed for OE based clutch. (Spec Part # SA59A or SA59S)

Brand:
Spec Clutches - Corporate Logo
ES#:
2570169
Mfg#:
SA5913
Back Ordered
$675.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Stage 1 Performance Chip - With Program Switching (Fully Loaded)

ES#5237 - 20TSTG1CHIP-4 - Stage 1 Performance Chip - With Program Switching (Fully Loaded) - Average gain of 40 HP & 75 LB-FT torque on 93 octane program! - APR - Audi

Average gain of 40 HP & 75 LB-FT torque on 93 octane program! Call In Or Chat For Best Price! 5X Entries For Our 25th Anniversary Sweepstakes!
This upgrade can be performed via our Chip & Ship method or the vehicle can be brought to ECS Tuning's fa
Ship your ECU for free, or drive your vehicle to our location

Brand:
APR - Corporate Logo
ES#:
5237
Mfg#:
20TSTG1CHIP-4
In Stock
ON SALE! SAVE 10%
$749.98

This product was last offered at the strikethrough price on
07-31-2026

$674.98 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

K04 Performance Software (Existing APR Customers) - 1 Program (Or Fully Loaded If Already Equipped)

ES#3509816 - PA100008 - K04 Performance Software (Existing APR Customers) - 1 Program (Or Fully Loaded If Already Equipped) - For customers that already have APR software on their car and are upgrading to a K04 - APR - Audi Volkswagen

For customers that already have APR software on their car and are upgrading to a K04 Call In Or Chat For Best Price! 5X Entries For Our 25th Anniversary Sweepstakes!
This upgrade can be performed via our Chip & Ship method or the vehicle can be brought to ECS Tuning's fa
Ship your ECU for free, or drive your vehicle to our location

Brand:
APR - Corporate Logo
ES#:
3509816
Mfg#:
PA100008
In Stock
ON SALE! SAVE 10%
$249.99

This product was last offered at the strikethrough price on
07-31-2026

$224.95 USD
This product is lifetime replacement eligible Lifetime Replacement

ECS Wheel Spacer & Bolt Kit - 6mm With Black Conical Seat Bolts

ES#2748186 - ECS10610KTWBC1 - ECS Wheel Spacer & Bolt Kit - 6mm With Black Conical Seat Bolts - Includes everything you need to install spacers on two wheels - ECS - Audi Volkswagen

Includes everything you need to install spacers on two wheels 10X Entries For Our 25th Anniversary Sweepstakes!
Please measure your hub protrusion to ensure it will still make contact with the center of the wheel. See

Brand:
ECS - Corporate Logo
ES#:
2748186
Mfg#:
ECS10610KTWBC1
In Stock
ON SALE!
$141.99

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

$134.89 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

034 Motorsport 2.5mm Wheel Spacer - Pair

ES#4751521 - 034-604-7010 - 034 Motorsport 2.5mm Wheel Spacer - Pair - 2.5mm Wheel Spacer Pair is designed to fit most Audi & Volkswagen vehicles with a 57.1mm center bore and 5x112mm wheel bolt patterns. - 034Motorsport - Audi Volkswagen

2.5mm Wheel Spacer Pair is designed to fit most Audi & Volkswagen vehicles with a 57.1mm center bore and 5x112mm wheel bolt patterns.

Brand:
034Motorsport - Corporate Logo
ES#:
4751521
Mfg#:
034-604-7010
In Stock
$48.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Density Line Adjustable Upper Control Arm Kit

ES#3183553 - 034-401-1000-KT - Density Line Adjustable Upper Control Arm Kit - Includes 034Motorsport Density Line adjustable upper control arms & necessary installation hardware - Assembled By ECS - Audi

Includes 034Motorsport Density Line adjustable upper control arms & necessary installation hardware 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
Assembled By ECS - Corporate Logo
ES#:
3183553
Mfg#:
034-401-1000-KT
Back Ordered
Auto Notify
$671.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Special Active Shocks & Struts Kit

ES#3563290 - 82451008KT - Special Active Shocks & Struts Kit - Superior handling without compromising ride quality - Koni - Audi

Superior handling without compromising ride quality

Brand:
Koni - Corporate Logo
ES#:
3563290
Mfg#:
82451008KT
In Stock at Vendor
$671.00

This product was last offered at the strikethrough price on
02-27-2026

$670.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Rear Exact-Fit Stainless Steel Brake Lines - Four Piece

ES#538 - B5S4SSBLK-REAR - Rear Exact-Fit Stainless Steel Brake Lines - Four Piece - Mid & Rear set of DOT-compliant lines for an improved pedal feel - ECS - Audi

Mid & Rear set of DOT-compliant lines for an improved pedal feel 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
ECS - Corporate Logo
ES#:
538
Mfg#:
B5S4SSBLK-REAR
In Stock
ON SALE! SAVE 10%
$148.99

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

$134.09 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Audi B9 A4 Pre-facelift Front Lip, Rear Diffuser & Trunk Spoiler

ES#5446989 - 028801ECS01EB3KT - Audi B9 A4 Pre-facelift Front Lip, Rear Diffuser & Trunk Spoiler - Add some aggressive styling to your Audi! - Enthusiast Bundles - Audi

Add some aggressive styling to your Audi! Don't See A Bundle You Want - Give Us A Call Or Chat - We Will Make One!

Brand:
Enthusiast Bundles - Corporate Logo
ES#:
5446989
Mfg#:
028801ECS01EB3KT
In Stock
ON SALE! SAVE 38%
$1086.35

This product was last offered at the strikethrough price on
05-06-2026

$669.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Front Exact-Fit Stainless Steel Brake Lines

ES#3410498 - 019318ECS01 - Front Exact-Fit Stainless Steel Brake Lines - Front set of DOT-compliant lines for an improved pedal feel - ECS - Audi

Front set of DOT-compliant lines for an improved pedal feel 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
ECS - Corporate Logo
ES#:
3410498
Mfg#:
019318ECS01
In Stock
ON SALE!
$140.99

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

$133.94 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Audi B8/8.5 A4/S4 Engine Bay Lighting Kit

ES#3690279 - 017146ECS01 - Audi B8/8.5 A4/S4 Engine Bay Lighting Kit - Seamlessly integrate ultra bright LED lighting under your hood! - ECS - Audi

Seamlessly integrate ultra bright LED lighting under your hood! 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
ECS - Corporate Logo
ES#:
3690279
Mfg#:
017146ECS01
Ships on Sep 3, 2026
ON SALE!
$140.99

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

$133.94 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Ball Seat Locking Wheel Bolt Kit

ES#2795758 - 003901ECS35BB - Ball Seat Locking Wheel Bolt Kit - Black zinc coated wheel lock bolts made specifically for OE wheels. M14x1.5x35mm - ECS - Audi Volkswagen

Black zinc coated wheel lock bolts made specifically for OE wheels. M14x1.5x35mm 10X Entries For Our 25th Anniversary Sweepstakes!
For use with 6-8mm spacers

Brand:
ECS - Corporate Logo
ES#:
2795758
Mfg#:
003901ECS35BB
Ships on Aug 20, 2026
ON SALE! SAVE 25%
$88.99

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

$66.74 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Turbo Muffler Delete Pipe Adapter O-ring - Priced Each

ES#3147457 - 9263K129 - Turbo Muffler Delete Pipe Adapter O-ring - Priced Each - Replacement O-ring for ECS Turbo Muffler Delete Pipe - ECS - Audi Volkswagen

Replacement O-ring for ECS Turbo Muffler Delete Pipe 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
ECS - Corporate Logo
ES#:
3147457
Mfg#:
9263K129
In Stock
ON SALE! SAVE 25%
$23.99

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

$17.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Street Density Rear Differential Bushings - Pair

ES#3176342 - 034-505-2001-SD - Street Density Rear Differential Bushings - Pair - Eliminates excessive rear differential movement and provides quick feedback - 034Motorsport - Audi

Eliminates excessive rear differential movement and provides quick feedback

Brand:
034Motorsport - Corporate Logo
ES#:
3176342
Mfg#:
034-505-2001-SD
In Stock
$44.00 USD
Free Shipping
on orders $49 and up
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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