hey people what size is the stock exhaust on a XR6 T?. I ask because I was looking at mine since I just got the car recently, it looks 3inch from the turbo then to what looks like a hi flow cat, then into a hi tech stainless rear muffler, I know its from Hi tech mufflers in Sydney cos its stamped in steel on it, is this an ideal setup its very loud deep note, what extra kw's do yous think would of been gained from this?? theres no centre muffler I hear that's a good mod?? thanks regards Joe