Shop Our Clearance Sale - Up To 80% Off FREE SHIPPING on Orders $49+ *exclusions apply
affirm financing terms & conditions

Menu

Call Us330-331-2003 ChatLive Chat Text Us!
0 Shopping Cart
Your Vehicle Clear

Audi B9 A4 Quattro 2.0T

    • Audi
    • BMW
    • Mercedes Benz
    • MINI
    • Porsche
    • Volkswagen

Saved Vehicles

My Vehicles
You currently have no stored vehicles.

Recent Vehicles

Recent Vehicles Manage Vehicles

You currently have no recent vehicles.

We'll automatically keep fully selected vehicles here for your convenience.

Call Us330-331-2003 ChatLive Chat Text Us!
Track My Order View Order History Submit a Return Contact Us Wholesale Information Lifetime Replacement Returns and Warranty Information
0
Call Us330-331-2003 ChatLive Chat Text Us!
Track My Order View Order History Submit a Return Contact Us Wholesale Information Lifetime Replacement Returns and Warranty Information
Cancel
0
Sales & Specials
Enter Your Vehicle
affirm financing terms & conditions
garage-red
Your Vehicle Audi B9 A4 Quattro 2.0T
Your Vehicle Audi B9 A4 Quattro 2.0T
Change Clear

Audi B9 A4 Quattro 2.0T Rear Bumper Diffusers

Sort By
Filter By
Return to Top

Audi B9 A4 S-Line Pre-Facelift Rear Diffuser - Gloss Black

ES#4265351 - 008480LA01 - Audi B9 A4 S-Line Pre-Facelift 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, S-line models (up to 2018), without integrated tips in the rear valance

Brand:
ECS - Corporate Logo
ES#:
4265351
Mfg#:
008480LA01
In Stock
ON SALE! SAVE 20%
$430.99

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

$344.79 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! affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms 10X Entries For Our 25th Anniversary Sweepstakes!

Fits pre-facelift S-Line models up to 2019 model year only

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

Carbon Fiber Rear Diffuser - Audi B9 A4

ES#3145741 - 019193ECS01A - Carbon Fiber Rear Diffuser - Audi B9 A4 - 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!

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

Brand:
ECS - Corporate Logo
ES#:
3145741
Mfg#:
019193ECS01A
In Stock
ON SALE!
$774.99

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

$719.99 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Audi B9 A4 Pre-facelift Rear Diffuser & Trunk Spoiler

ES#4751276 - 028801ECS01EB2KT - Audi B9 A4 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! affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Fits pre-facelift, S-line models (up to 2018), without integrated tips in the rear valance

Brand:
Enthusiast Bundles - Corporate Logo
ES#:
4751276
Mfg#:
028801ECS01EB2KT
In Stock
ON SALE! SAVE 35%
$706.56

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

$458.18 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 affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Fits S-line models only with quad exit exhaust

Brand:
Deval - Corporate Logo
ES#:
4000981
Mfg#:
D38234
Special Order: No Guaranteed ETA
$890.00 USD
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! affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

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
Scratch and Dent Item

Audi B9 A4 S-Line Pre-Facelift Rear Diffuser - Gloss Black - (NO LONGER AVAILABLE) *Scratch And Dent*

ES#5425758 - 008480LA01 - Audi B9 A4 S-Line Pre-Facelift Rear Diffuser - Gloss Black - (NO LONGER AVAILABLE) *Scratch And Dent* - Add some aggressive styling to your Audi! - Scratch & Dent - Audi

Add some aggressive styling to your Audi! ALL SALES FINAL. ITEMS MAY BE DAMAGED OR MISSING COMPONENTS. PLEASE SEE IMAGES BEFORE PURCHASING. Want To Haggle? Give Us A Call Or Chat To Make An Offer On This Product! affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
Scratch & Dent - Corporate Logo
ES#:
5425758
Mfg#:
008480LA01
In Stock
ON SALE! SAVE 25%
$422.99

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

$318.99 USD

ECS Tuning is not affiliated with any automobile manufacturers.
Manufacturer names and/or part numbers are used only for identification purposes.

Terms of Use Privacy Policy ECS Tuning is part of Enthusiast Auto Holdings