
Cat-Back Exhaust
Milltek Resonated Cat-Back Exhaust | Lexus GX 550 3.4 Turbo V6 - Burnt Titanium TipsMilltek

Cat-Back Exhaust
Brand: Milltek
Part #: SSXAU557
SKU: MK-SSXAU557
Milltek Race Cat-Back Exhaust System for Audi B8 S4 Supercharged V6 and B8 S5. Non-resonated design engineered for direct OEM fitment, delivering increased exhaust flow and an aggressive, full-throttle tone character. Constructed from T304L stainless steel, mandrel-bent throughout with hand-finished Cerakote Black quad trims. Uses factory hangers and mounting points-no modification required. The 2.37" (60.30mm) bore facilitates improved scavenging and measurable performance gains on dyno testing. Fitment • Audi B8 S4 Supercharged V6 (2009-2012) • Audi B8 S5 V6 (2009-2012) Technical Specifications • Pipe Diameter: 2.37" (60.30mm) • Material: T304L stainless steel • Design: Non-resonated (race specification) • Finish: Hand-finished with Cerakote Black quad trims • Installation: Direct factory fitment, OEM+ compatibility Designed and manufactured in the UK with 40+ years of performance exhaust heritage. Tested at the Nurburgring.

Cat-Back Exhaust
Milltek Resonated Cat-Back Exhaust | Lexus GX 550 3.4 Turbo V6 - Burnt Titanium TipsMilltek

Cat-Back Exhaust
Milltek Resonated Cat-Back Exhaust | Lexus GX 550 3.4 Turbo V6 - Brushed Titanium TipsMilltek

Cat-Back Exhaust
Milltek Resonated Cat-Back Exhaust | Lexus GX 550 3.4 Turbo V6 - Cerakote Black TipsMilltek

Cat-Back Exhaust
Milltek Resonated Cat-Back Exhaust | Lexus GX 550 3.4 Turbo V6 - Polished TipsMilltek