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

Cat-Back Exhaust
Brand: Milltek
Part #: SSXAU688
SKU: MK-SSXAU688
The Milltek Non-Resonated Cat-Back Exhaust System is engineered for the Audi B9 S5 3.0 V6 Turbo Coupe and Cabriolet (Non-Sport Diff models only). This direct factory fitment system replaces the OEM cat-back section, delivering enhanced exhaust flow and aggressive sound character without modification. Constructed from T304L stainless steel and hand-finished, the system features a 2.50" (63.50mm) mandrel-bent pipe diameter for optimized scavenging. The non-resonated design eliminates the factory resonance chamber, producing a more pronounced full-throttle note while maintaining street-legal operation. Quad GT-100 Burnt Titanium trims provide premium aesthetics and heat resistance. Uses OEM hangers and mounting points for seamless installation. Fitment & Compatibility • Direct fit: Audi B9 S5 3.0 TFSI V6 Turbo Coupe (2016-2023) • Direct fit: Audi B9 S5 3.0 TFSI V6 Turbo Cabriolet (2016-2023) • Non-Sport Differential models only - verify before purchase • No OEM hangers or brackets require modification • Cat-back only - factory downpipe and secondary catalytic converters remain in place Hand-finished T304L construction, dyno-proven sound character, and OEM+ fitment define the Milltek standard. 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
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Cat-Back Exhaust
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Cat-Back Exhaust
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