Milltek Non-Resonated Cat-Back Exhaust - Audi B6 S4 - Cerakote Black Tips - SSXAU872

The Milltek Non-Resonated Cat-Back Exhaust System is engineered for the Audi B6 S4 4.2 V8 Quattro (Saloon, Sedan, Avant, Cabriolet). This is a direct factory fitment cat-back system-replaces the OEM exhaust from the rear of the secondary catalytic converters back, requiring no vehicle modification.

Hand-finished T304L stainless steel construction with 2.25" (57.15mm) mandrel-bent piping and Jet-100 Cerakote Black trim finishes. The non-resonated design eliminates the OE resonance chamber, delivering a more pronounced full-throttle character while maintaining direct OEM hanger compatibility and ease of installation.

Fitment & Compatibility

• Audi B6 S4 Saloon (2003-2005)
• Audi B6 S4 Sedan (2003-2005)
• Audi B6 S4 Avant (2003-2005)
• Audi B6 S4 Cabriolet (2003-2005)
• 4.2L FSI V8 engine (engine code ASP)
• Replaces OEM cat-back system only-secondary cats remain stock

Designed and manufactured in the UK with 40+ years of performance exhaust heritage. Tested at the Nurburgring.

Specifications

• Pipe diameter: 57.15mm (2.25")
• Fitting time: 2 to 3 hours, including removing the factory system

Fitment

• Audi > S4 > 4.2 V8 quattro B6 Saloon/Sedan, Avant, & Cabriolet > 2003 to 2005

• Free US shipping on orders over $250.
• Free pickup at our Dallas shop, usually ready within 24 hours.
• Unused parts can be returned within 30 days. Tunes, opened electronics, merch and installed parts are final sale.
• Want it installed? Book the install at thegbmotors.com.

Full details are on our shipping and returns page.