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 S4 Quattro 3.0T

    • 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 S4 Quattro 3.0T
Your Vehicle Audi B9 S4 Quattro 3.0T
Change Clear

Audi B9 S4 Quattro 3.0T Milltek Cat-Back Exhausts

Sort By
Filter By
Return to Top

Cat-Back Exhaust System - Non-Resonated (Louder)

ES#3240938 - SSXAU657 - Cat-Back Exhaust System - Non-Resonated (Louder) - 2.50" stainless steel with quad GT-90 titanium tips - Milltek Sport - Audi

2.50" stainless steel with quad GT-90 titanium tips affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Fits models without factory rear sports differential

Brand:
Milltek Sport - Corporate Logo
ES#:
3240938
Mfg#:
SSXAU657
Ships in 3 Business Days
ON SALE! SAVE 10%
$4158.99

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

$3742.22 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Cat-Back Exhaust - Non Resonated

2.50" stainless steel with your choice of tip style affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
Milltek Sport - Corporate Logo
ES#:
4164626
Mfg#:
B9NONRESONATED
Ships in 3 Business Days
ON SALE!
Starting at $3156.71 USD
Customize
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Cat-Back Exhaust System - Resonated With Exhaust Valves

ES#3240918 - SSXAU641 - Cat-Back Exhaust System - Resonated With Exhaust Valves - 2.50" stainless steel with quad GT-100 Cerakote black tips - Milltek Sport - Audi

2.50" stainless steel with quad GT-100 Cerakote black tips affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Fits models without factory rear sports differential
For vehicles without a sport differential

Brand:
Milltek Sport - Corporate Logo
ES#:
3240918
Mfg#:
SSXAU641
Ships in 3 Business Days
ON SALE! SAVE 10%
$3752.99

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

$3377.24 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

Cat-Back Exhaust - Resonated

2.50" stainless steel with your choice of tip style affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

Brand:
Milltek Sport - Corporate Logo
ES#:
4164540
Mfg#:
B9RESONATED
Ships in 3 Business Days
ON SALE!
Starting at $3116.70 USD
Customize
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

B9 S4/S5 Cat-Back Exhaust System - Non-Resonated (Louder)

ES#3466846 - SSXAU701 - B9 S4/S5 Cat-Back Exhaust System - Non-Resonated (Louder) - 2.50" stainless steel with quad GT-100 cerakote black tips - Milltek Sport - Audi

2.50" stainless steel with quad GT-100 cerakote black tips affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Fits models with factory rear sports differential

Brand:
Milltek Sport - Corporate Logo
ES#:
3466846
Mfg#:
SSXAU701
Ships in 3 Business Days
ON SALE! SAVE 10%
$3507.99

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

$3156.71 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement
Scratch and Dent Item

Milltek Sport Cat-Back Exhaust System - Resonated With Exhaust Valves*Scratch And Dent*

ES#4730281 - SSXAU695sd - Milltek Sport Cat-Back Exhaust System - Resonated With Exhaust Valves*Scratch And Dent* - 2.50" stainless steel with quad GT-100 Cerakote black tips - Scratch & Dent - Audi

2.50" stainless steel with quad GT-100 Cerakote black tips 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#:
4730281
Mfg#:
SSXAU695SD
In Stock
ON SALE! SAVE 50%
$3283.00

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

$1641.50 USD
Scratch and Dent Item

Cat-Back Exhaust System - Non-Resonated (Louder) *Scratch And Dent*

ES#5375603 - SSXAU701 - Cat-Back Exhaust System - Non-Resonated (Louder) *Scratch And Dent* - ***S&D NOTE: Only contains two mufflers - Sold As Is - See photos prior to ordering - ALL SALES FINAL*** - Scratch & Dent - Audi

***S&D NOTE: Only contains two mufflers - Sold As Is - See photos prior to ordering - ALL SALES FINAL*** 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#:
5375603
Mfg#:
SSXAU701
In Stock
ON SALE! SAVE 30%
$3075.00

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

$2152.50 USD

Cat-Back Exhaust System - Resonated With Exhaust Valves

ES#3236155 - SSXAU649 - Cat-Back Exhaust System - Resonated With Exhaust Valves - 2.50" stainless steel with quad Cerakote black velvet oval tips - Milltek Sport - Audi

2.50" stainless steel with quad Cerakote black velvet oval tips affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Fits models without factory rear sports differential
For vehicles without a sport differential

Brand:
Milltek Sport - Corporate Logo
ES#:
3236155
Mfg#:
SSXAU649
Ships in 3 Business Days
ON SALE! SAVE 10%
$4236.99

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

$3812.52 USD
Free Shipping
This product is lifetime replacement eligible Lifetime Replacement

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