Check out the ExhaustGuys, their members on the boards and could cut you a nice price on a Magnaflow. I love mine, and I got it for a great price.
Call James @ 201-891-1133 or email them @
streetofdreams2004@yahoo.com
Just send them the specs. My friend Ted went through them and got a magnaflow on his 89 Iroc. Sounds great with headers & a hi-flow.