Test pipes will definitely rasp a lot like you mentioned. Header wrap around the TP is a good inexpensive solution. Next best thing is look for something resonated if you are still unhappy with it. Regarding headers, they do have a much cleaner sound. My PPE's rasp but with a HFC, it's very minimal now. I haven't really heard any with the F.I. LTH's. Either way, it's an expensive upgrade from TP's to gain maybe 5whp.
__________________
Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI
New Car: Under Construction
|