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    • Reference: RS.B9RS5.RS4.DP

      Brand: RedStar Exhaust

      Audi B9 RS5 / RS4 Downpipes

      REDSTAR EXHAUST performance downpipes for the new 2018+ Audi B9 RS5 / F5 RS4 with Porsche 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 RS5...

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