Nigel, Kris fabricated my exhaust when my car was at his shop, and i gave him the ok to run the exhaust under my rear crossmember. I'm pretty sure his production exhaust was planned to run over the rear crossmember, but we were short on time. I have to say though, that even with a quickly fabricated exhaust, the quality and fitment of the exhaust was wonderful. It followed the oil pan perfectly and aligned between the chassis and front crossmember perfectly. I'm very happy with it. It sounds very good, with a much lower pitch, almost Supra sound to it, not the raspy Honda bumble bee sound that my old muffler/exhaust resembled more of. It is definately louder though, mainly because it is much less restrictive. If noise is an issue, like Kris said, there is a silencer/restricter that you can install. When I install mine in my exhaust, it quiets it down quite a bit.
Just wanted to give you my input on the exhaust Kris made for my car, as I saw it was mentioned with questions about it...
Trevor