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

Cat-Back Exhaust
Brand: Milltek
Part #: SSXAU684
SKU: MK-SSXAU684
Milltek Non-Resonated Cat-Back Exhaust System for Audi B9 S5 3.0 V6 Turbo Coupe and Cabriolet (Non-Sport Differential models only). Direct factory fitment replacement using OEM hangers, no modification required. Hand-finished T304L stainless steel construction with mandrel-bent 2.50" (63.50mm) diameter piping. Quad JET-100 carbon fiber trim outlets. Non-resonated design engineered for aggressive full-throttle character and elevated tone at cruising speeds. OEM+ fitment preserves all factory suspension and component clearances. Fitment • Audi B9 S5 Coupe (2017-2023) - 3.0L TFSI EA839 engine • Audi B9 S5 Cabriolet (2017-2023) - 3.0L TFSI EA839 engine • Non-Sport Differential models only • Cat-back system: retains OEM catalytic converters and secondary cats Dyno-proven performance gains with engineered sound character tuned to the B9 S5's flat-plane V6 resonance. Designed and manufactured in the UK with 40+ years of performance exhaust heritage. Tested at the Nurburgring.

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