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

Cat-Back Exhaust
Brand: Milltek
Part #: SSXAU647
SKU: MK-SSXAU647
The Milltek Resonated Cat-Back Exhaust System is a direct factory replacement for the Audi B9 S4 and S5, engineered to enhance exhaust flow and refine the OE+ sound character without aggressive resonance. This system uses 2.50" (63.50mm) mandrel-bent T304L stainless steel throughout, hand-finished for durability and corrosion resistance. Installation requires no modification - the system uses OEM hangers and integrates seamlessly with factory components. The resonated design tuned to eliminate drone at cruising speeds while delivering a more pronounced full-throttle note. Quad GT-90 burnt titanium trims are included as standard. Fitment • Audi S4 3.0 Turbo V6 B9 Saloon/Sedan & Avant (non-sport differential models) 2016+ • Audi S5 3.0 Turbo V6 B9 Sportback (non-sport differential models) 2017+ Engineered in-house and tested to deliver measurable flow improvements and refined acoustic character. 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