Radz, I just made 631 RWHP @ 7.5 lbs boost on 91 octane pump gas,
with a Vortech V-3si and ARH Long tubes, high flow cats, 3" exhaust
and Magnaflow muffler. Custom RMCR tune. No other mods.
Here's my build thread:
http://www.camaro5.com/forums/showthread.php?t=51856