Reference: RS.B9RS5.RS4.DP

Brand: RedStar Exhaust

Audi B9 RS5 / RS4 Downpipes

REDSTAR EXHAUST downpipes for the Audi B9 RS5 / F5 RS4 with Porsche 2.9L. 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. B9 RS5 Downpipes Video F5 RS4 Downpipes Video B9 RS5...