I have had a y-pipe and cat delete pipe off a 93 LT1 was only used for a few months before car was totaled. Fits perfect to stock exhaust manifold and is larger diameter than stock. Cat delete pipe is hard to find and is 3 inch diameter also from RKS sports. The throttle body I bought used last year off another member and has not been installed . Go to my proflle for pictures of exhaust or PM me for any questions and prices.