I'm planning on gutting my u/p tomorrow. Three question. I've heard that when you do an aftermarket install its a good idea to have new stud bolts on hand. I think the writeup says 5 is what it takes. Is that still true for reusing the gutted pipe. Second, do you think the need for new gaskets is the same a gutted pipe. Last, do people usually double up these gaskets or are you guys just using the one?