My engine will be ready to go tomorrow after its complete rebuild. The engine had a hole in the piston and the previous driver drove it for several thousand miles with it like this. So a lot of oil was coming out of the tail pipe. So do you think I need to change the cat and muffler? I don't want to have all this money in a rebuild, but still lack alot of power due to a clogged cat. Or do you think the oil will make no difference and probably burn out in a while??

88 P/U EFI 4x4... Stock for now.. 05 Corvette MN6 Z51 Package