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Audi S4 Performance Exterior Parts & Upgrades

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ES#4147363 - 028807ecs01KT - Audi B8.5 S4 / A4 S-Line Rear Diffuser - Gloss Black - Add some aggressive styling to your Audi! - ECS - Audi

Add some aggressive styling to your Audi! affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes!

Fits facelift B8.5 (2013+) models only

Brand:
ECS - Corporate Logo
ES#:
4147363
Mfg#:
028807ECS01KT
In Stock
ON SALE! SAVE 25%
$399.99

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

$299.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement
ES#4164657 - 028806ecs01KT - Audi B8.5 S4 / A4 S-Line Facelift Front Lip - Gloss Black - Upgrade your exterior styling! - ECS - Audi

Upgrade your exterior styling! affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes!

For vehicles from the 2013 model year (Facelift)

Brand:
ECS - Corporate Logo
ES#:
4164657
Mfg#:
028806ECS01KT
In Stock
ON SALE! SAVE 35%
$381.09

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

$249.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement
ES#4056580 - 006077LA01 - Audi B9 S4 Rear Diffuser - Gloss Black - Add some aggressive styling to your Audi! - ECS - Audi

Add some aggressive styling to your Audi! affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes!

Fits pre-facelift models (up to 2019) without integrated tips in the rear valance

Brand:
ECS - Corporate Logo
ES#:
4056580
Mfg#:
006077LA01
In Stock
ON SALE! SAVE 27%
$411.99

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

$299.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement
ES#4147652 - 028802ecs01KT - Audi B9 A4/S4 Front Lip Spoiler - Gloss Black - Upgrade your exterior styling! - ECS - Audi

Upgrade your exterior styling! affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes!

For 2018 Models Only

Brand:
ECS - Corporate Logo
ES#:
4147652
Mfg#:
028802ECS01KT
In Stock
ON SALE! SAVE 33%
$370.79

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

$249.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement
ES#4033487 - 028808ECS01 - Audi B8 S4 / A4 S-Line Rear Diffuser - Gloss Black - Add some aggressive styling to your Audi! - ECS - Audi

Add some aggressive styling to your Audi! affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes!

Fits pre-facelift B8 models only

Brand:
ECS - Corporate Logo
ES#:
4033487
Mfg#:
028808ECS01
In Stock
ON SALE! SAVE 20%
$411.99

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

$329.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement
ES#2771912 - 003251ECS01AKT2 - ECS Tuning Street Shield Aluminum Skid Plate Kit - Protect your vehicle's oil pan & electronic steering rack with this 4mm thick aluminum skid plate - ECS - Audi

Protect your vehicle's oil pan & electronic steering rack with this 4mm thick aluminum skid plate affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes!
Fits B8 chassis A4/S4/A5/S5 models from the 2013 model year

Brand:
ECS - Corporate Logo
ES#:
2771912
Mfg#:
003251ECS01AKT2
In Stock
ON SALE!
$407.99

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

$387.59 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement
ES#4045736 - 024716ecs02KT - Audi B8/B8.5 A4/S4 Flat Side Skirts - Gloss Black - Enhance your side profile with an aggressive look! - ECS - Audi

Enhance your side profile with an aggressive look! affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
ECS - Corporate Logo
ES#:
4045736
Mfg#:
024716ECS02KT
In Stock
ON SALE! SAVE 27%
$339.89

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

$249.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement
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 affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
ECS - Corporate Logo
ES#:
3411957
Mfg#:
019207ECS01KT
Ships in 1 Business Day
$383.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement
ES#3619834 - 026861ECS01 - Audi B8/B8.5 S4 Trunk Spoiler - Gloss Black - Add some aggressive styling to your Audi! - ECS - Audi

Add some aggressive styling to your Audi! affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
ECS - Corporate Logo
ES#:
3619834
Mfg#:
026861ECS01
In Stock
ON SALE! SAVE 57%
$321.99

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

$140.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement
ES#2771379 - 003251ECS01AKTKT -  ECS Tuning Street Shield Aluminum Skid Plate Kit - Protect your vehicle's oil pan & electronic steering rack with this 4mm thick aluminum skid plate - ECS - Audi

Protect your vehicle's oil pan & electronic steering rack with this 4mm thick aluminum skid plate affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes!
Fits B8 chassis A4/S4/A5/S5 models up to the 2012 model year

Brand:
ECS - Corporate Logo
ES#:
2771379
Mfg#:
003251ECS01AKTKT
In Stock
ON SALE! SAVE 10%
$407.99

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

$367.19 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement
ES#4164865 - 028805ecs01KT - Audi B8 S4 / A4 S-Line Pre-Facelift Front Lip - Gloss Black - Upgrade your exterior styling! - ECS - Audi

Upgrade your exterior styling! affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes!

For vehicles up to the 2012 model year (Pre-Facelift)

Brand:
ECS - Corporate Logo
ES#:
4164865
Mfg#:
028805ECS01KT
In Stock
ON SALE! SAVE 30%
$308.99

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

$216.29 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement
ES#4158342 - 025864ecs01aKT - Audi B8.5 S4 / A4 S-Line Facelift Front Lip - Splitter Style - Gloss Black - Upgrade your exterior styling! - ECS - Audi

Upgrade your exterior styling! affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes!

For vehicles from the 2013 model year (Facelift)

Brand:
ECS - Corporate Logo
ES#:
4158342
Mfg#:
025864ECS01AKT
In Stock
ON SALE! SAVE 35%
$352.25

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

$229.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement
ES#3981207 - 028801ECS01 - Audi B9 S4/A4 Trunk Spoiler - Gloss Black - Add some aggressive styling to your Audi! - ECS - Audi

Add some aggressive styling to your Audi! affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes!

Requires removal of the factory trunk spoiler

Brand:
ECS - Corporate Logo
ES#:
3981207
Mfg#:
028801ECS01
In Stock
ON SALE! SAVE 37%
$284.99

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

$180.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement
ES#4163869 - 001734la01 - Audi B9 A4 / S4 Flat Side Skirts - Gloss Black - Enhance your side profile with an aggressive look! - ECS - Audi

Enhance your side profile with an aggressive look! affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
ECS - Corporate Logo
ES#:
4163869
Mfg#:
001734LA01
In Stock
ON SALE! SAVE 25%
$356.99

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

$269.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement
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 affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes!

From the 2013 model year

Brand:
ECS - Corporate Logo
ES#:
3085916
Mfg#:
018359ECS01A
In Stock
ON SALE! SAVE 15%
$999.99

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

$849.00 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement
ES#4840231 - 030456la01KT - Audi B5/B6/B7 A4/S4 Street Shield Skid Plate Kit - Protect vital drivetrain and chassis components from costly damage with this durable 7GA aluminum skid plate! - ECS - Audi Volkswagen

Protect vital drivetrain and chassis components from costly damage with this durable 7GA aluminum skid plate! affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes!

Brand:
ECS - Corporate Logo
ES#:
4840231
Mfg#:
030456LA01KT
In Stock
ON SALE!
$388.99

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

$377.32 USD
This product is lifetime replacement eligible Lifetime Replacement

More About Performance Exterior Parts & Upgrades

Make your car stand out with our catalog of exterior upgrades like spoilers, diffusers, side skirts, and more.

Let us help you find the parts that fit your Audi

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Manufacturer names and/or part numbers are used only for identification purposes.

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