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Audi B9 S4 Quattro 3.0T

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Audi B9 S4 Quattro 3.0T Rear Bumper Diffusers

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Audi B9 S4 Rear Diffuser - Gloss Black

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! 10X Entries Into Our F80 M3 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 25%
$420.99

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

$315.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Audi B9 S4 Carbon Fiber Rear Diffuser

ES#3247439 - 023797ECS01 - Audi B9 S4 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 Into Our F80 M3 Sweepstakes

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

Brand:
ECS - Corporate Logo
ES#:
3247439
Mfg#:
023797ECS01
In Stock
ON SALE! SAVE 42%
$1029.99

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

$599.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Audi B9 S4 / A4 S-Line Rear Bumper Side Splitters - Gloss Black

ES#4164511 - 004751la01 - Audi B9 S4 / A4 S-Line Rear Bumper Side Splitters - Gloss Black - Spice up the exterior of your Audi with gloss black spats! - ECS - Audi

Spice up the exterior of your Audi with gloss black spats! 10X Entries Into Our F80 M3 Sweepstakes

Fits pre-facelift models up to 2019 model year

Brand:
ECS - Corporate Logo
ES#:
4164511
Mfg#:
004751LA01
In Stock
ON SALE! SAVE 25%
$133.99

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

$100.49 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Audi B9 S4 Pre-facelift Rear Diffuser & Trunk Spoiler

ES#4751275 - 028801ECS01EBKT - Audi B9 S4 Pre-facelift 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!
Fits pre-facelift models (up to 2019) without integrated tips in the rear valance

Brand:
Enthusiast Bundles - Corporate Logo
ES#:
4751275
Mfg#:
028801ECS01EBKT
In Stock
ON SALE! SAVE 34%
$696.26

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

$458.51 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Carbon Fiber Rear Diffuser

ES#4000981 - D38234 - Carbon Fiber Rear Diffuser - Designed and manufactured to improve performance and everyday drivability - Deval - Audi

Designed and manufactured to improve performance and everyday drivability

Brand:
Deval - Corporate Logo
ES#:
4000981
Mfg#:
D38234
Special Order: No Guaranteed ETA
$890.00 USD
This product is lifetime replacement eligible Lifetime Replacement

S4 Rear Bumper Valance - Twilight Matte

With a dual exit, quad tip design For S-Line/S4 bumpers only
For Pre-Facelift Models Only

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
3181064
Mfg#:
8W0807521DRP5
Ships in 3 Business Days
12% off MSRP

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

$680.99

This product was last offered at the strikethrough price on
08-31-2026

$599.99 USD
This product is lifetime replacement eligible Lifetime Replacement

S4 Rear Bumper Valance - Twilight Matte

With a dual exit, quad tip design For facelift models only

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
4625727
Mfg#:
8W0807521ACY9B
Ships in 1-2 days
12% off MSRP

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

$680.99

This product was last offered at the strikethrough price on
08-31-2026

$599.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Audi B9 S4 Carbon Fiber Exterior Package

ES#5456442 - 023797ECS01KT2 - Audi B9 S4 Carbon Fiber Exterior Package - Experience a full exterior transformation! This bundle pairs our carbon fiber front lip spoiler, rear diffuser, and rear trunk lid spoiler at a fraction of retail price. - Enthusiast Bundles - Audi

Experience a full exterior transformation! This bundle pairs our carbon fiber front lip spoiler, rear diffuser, and rear trunk lid spoiler at a fraction of retail price. Don't See A Bundle You Want - Give Us A Call Or Chat - We Will Make One!
Save an additional $100 with this Enthusiast Bundle!

Brand:
Enthusiast Bundles - Corporate Logo
ES#:
5456442
Mfg#:
023797ECS01KT2
Ships on Nov 30, 2026
ON SALE! SAVE 29%
$2599.99

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

$1849.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

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

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