I was toying with the idea of going with an On3 turbo since my D1 is officially dead. But I think I'll switch over to an an F1A instead. I still have all my stuff from the D1. There was a video of a Mach 1 on the same page as Derek's Cobra and in the driving around part and the F1A didn't seem to bad noise wise. I think I'm going to have to run a 4.5" pulley to get anything below 20psi with my overdrive crank pulley though.
Last edited: