Milltek Resonated Cat-Back Exhaust - Audi B9 S4 S5 - Burnt Titanium Tips - SSXAU643

Milltek 2.50" Resonated Cat-Back Exhaust System for Audi B9 S4 and S5 (non-sport differential models). Direct factory fitment replacement using OEM hangers; no modification required. Mandrel-bent T304L stainless steel construction with hand-finished quad GT-100 burnt titanium trim tips.

The resonated design eliminates resonance peaks while preserving OE+ tone character across the rpm range. 63.50mm (2.50") pipe diameter optimizes scavenging for the 3.0L turbo V6. CNC-formed internals tuned for the B9 platform's backpressure curve. Dyno-proven gains in mid-range torque delivery without sacrificing street usability.

Fitment

• Audi S4 3.0 Turbo V6 B9 Saloon/Sedan and Avant - 2016 and later (non-sport differential models)
• Audi S5 3.0 Turbo V6 B9 Sportback - 2017 and later (non-sport differential models)

Hand-finished stainless construction resists thermal cycling and corrosion. Each system is decibel-tested to ensure compliance with street use while delivering engineered sound character.

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

Specifications

• Pipe diameter: 63.5mm (2.50")
• Fitting time: 1 to 1.5 hours, including removing the factory system
• E-marked for road use

Fitment

• Audi > S4 > 3.0 Turbo V6 B9 - Saloon/Sedan & Avant (ONLY - Non Sport Diff Models) - Left Hand Drive Cars Only > 2016 and Later
• Audi > S5 > 3.0 V6 Turbo Sportback B9 (ONLY - Non Sport Diff Models Only) - Left Hand Drive Cars Only > 2017 and Later

• 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.