Porsche 997 GT2 Turbo RSR WideBody – EPIC Turbo Whistle & Blow Off Valve Sound, Onboard Misano Track Street Races by turboandstance - August 5, 2020August 5, 2020 Porsche 997 GT2 Turbo RSR WideBody at the Misano circuit during two days of testing for racing cars. We were amazed by the whistle of the double turbine and the Blow-off valve; we think we have never heard a Porsche sound in such an epic way! We have to thank