Ive got 2 thrush turbos mufflers to put on Sat. The whole reason I had the stock ones off were because I Had orginally got 2 glasspacks (2 1/4 in and out) just like I had on my gtp, but the exhaust on the gtp is 2 1/4 in. and the SS is 2in which makes no sense. So I had to take the glasspacks back and got the cheaper turbo mufflers. Worked out good because the lil money I saved from them allowed me to order my headers which should be here next week!