Join Date: Jan 2008
Location: Marlborough, MA
I doubt you would lose any performance at all, and I doubt the PCM would have to adapt much, if at all. From what I understand, the scavenging effect caused by the sound waves traveling in the header tubes - that effect is stopped at the first "discontinuity" - like the first drastic expansion in the pipe - in most cases the catalytic converters. Anything you do after that should not really affect cylinder filling (within reason of course). Just removing resonators would not do it.
I have always felt that a louder car doesn't feel as fast to me. I think viscerally I'm equating loudness with performance, and I'm expecting a lot more speed from the increase in noise. But that's just me. The only way to tell is before and after dyno sessions. Or perhaps track sessions if you do the DA correction between days....
2009 SRM G8 GT, GMPP CNC heads milled .035", RCR backcut intake valves, RCR Lunati 219/223 .612/.615 112+1, PSI 1511ML springs, Ti retainers, BTR 7.375 pushrods, Straub trunion bushings, RCR Airram intake, IWIS chain, Melling hi-vol hi-pressure oil pump, oil bypass blockoff, LS7 MAF in Spectre 4", Blox velocity stack, Rotofab, Kooks 1-3/4" LT's, Kooks catted X, Hooker Maxflow axlebacks. 426/383.