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  • REDSTAR EXHAUST performance downpipes for the new 2018+ Audi B9 RS4/RS5 with Porsche twin-turbo 2.9 engine. Our downpipes utilize a big bore design with smooth transitions for maximum flow efficiency. Long cones used to reduce the OEM 127mm turbo flanges to 89mm main diameter, which then goes down with second transition to 76mm lower 3-bolt flanges. B9...

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