[SleeperGT]

After the stock Vortech install the car dyno'd at 313 rwhp and 370 rwtrq. Car ran a best of 106 mph at 13.0. I had a custom Diablo chip (not dyno tuned) and Anderson Powerpipe installed and the car ran 111 mph @ 12.6. I didn't have it dyno'd since these latest upgrades so the question is how much hp is 5 mph worth? I'm guessing I am currently running about 360 rwhp or so.

Could long tubes introduce any sort of detonation issue on the car (I just went through a lot of back and forth getting my chip set right for the car....clean up major driveability and detonation issues) and I really don't want to go through that again if adding long tubes could would require a new chip program.