Turbo Pro Muffler - Optimal Flow, No Drone, No Resonance

67, I can look up some numbers and make a good, educated guess later today.

67 here is my opinion after looking at data. These new ones from Pypes will have a lower tone and will produce almost exactly the same sound levels on a typical street engine-powered car with 2.5" pipes. They will idle and drive at about the same sound level but will have a smoother sound and will be less crackly. These new ones will flow around 50% more exhaust gasses under high load conditions than the typical turbocharged Corvair muffler would. They will make the engine sound more throaty and less "cacklely" than the Corvair muffler due to the sound absorbing material inside of them