will i be able to use a stock fourth gen cat. from a V6 on my third gen V6 car? i dont see why not but it doesnt hurt to ask,right?my buddy has a brand new cat. but his car just got wrecked.i have a cat back exhaust ready to go on, but would like to do the cat. at the same time if possible.thanks for any input.

 

As long as the exhaust pipes are the same size or fab the pipes to fit.