A single standard Pro-Flo bypass was not enough for my D1SC @ 15psi. I would get light compressor surge after snapping the throttle shut at 4500+ rpm. I did not have this problem when I was non-intercooled, but once I added the intercooler and had a much larger volume of compressed air to "dump" when closing the throttle the single Pro-Flo was not enough.
I now run 2 Pro-Flo valves. No more surge problems and it's *MUCH* quieter than the Race bypass valve which is really, really noisy.
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1969 Chevelle
Old setup: Procharged/intercooled/EFI 353 SBC, TKO, ATS/SPC/Global West suspension, C6 brakes & hydroboost.
In progress: LS2, 3.0 Whipple, T56 Magnum, torque arm & watts link, Wilwood Aero6/4 brakes, Mk60 ABS, Vaporworx, floater 9" rear, etc.
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