I want to put an exhaust cut out in my exhaust on my rex. I was going to get something from summit racing, basic manual cap-it-off style. But what size is the stock pipe before the muffler? I'm assuming this would be the place to have it welded in correct? Anyone else have any experience with this? Will it give me any performance gains? It shouldnt be TOO loud with all the other stock cats still in right? Im running a stock setup right now. Thanks for any help!