if its an after sale exhaust it should already be derestricted, if not wat to look for is a pipe that comes out from the pipe that is connect to the muffler kinda bit, it would be about 10" long and is crimped and welded at the end, to solve this cut off as close to down pipe, leaving enuff to crimp and weld. If u look down the hole where the pipe connects to the engine this should be about 1" in diameter if it looks smaller than the engine port than it mite have had a washer welded in the end to restrict the exhaust gases leaving which will restrict performance, this needs to be drilled out. need any more help mail me at robertsbad@hotmail.com
rob remember me, July 2007