To my knowledge Nicson didn't make an exhaust for a Chev, and Fenton didn't make an exhaust for a GMC (I bought Patrick's first Fenton set that he shifted the cores back in the '80's). The Corvette has GM's expensive engineering behind them, unfortunatly you can't go to your local Chevy dealer and buy a set for $19.95 anymore, but, the old standby Fentons, and the Russell's (?) made in Oregon work great.
As they say: Just my $.02
Tim
