Originally Posted by F.I. Inc.

I cannot stress this enough. You do not need to replace the 4 nuts that connect the stock cats to our cat back exhaust system. As long as you do not destroy them coming off they will work just fine forever! The stock gaskets mate up better to the stock cats this is why we retain them. They are 3-4 layer metal and again as long as you do not destroy them they will work fine.