92 GXE 190k miles still smooth....
I got a new performance exhaust (4.5") and I got the prformance imtake filter..
My question is do I have to make any changes to my stock pipe or my catilatic converter ...

 

4.5 are you sure you don't mean 2.5? I would go ahead and call wsp and get an aftermarket cat because if you have the stock cat I believe it is a 2" hole in and out...you dont have too but why would you want a bigger exhaust but not change the cat to match it?

 

I bet he means a 4.5 tip.