I am in the process of replacing my Cat, but the thing wont come off. Its got the three bolts in a triangle at the end (got those off) and then there is a clamp at the front of the cat (got it off as well). But my problem is this.....The part with the clamp, the cat is slid over the pipe coming from the exhaust manifolds, but I cant get it to slide off of it. I've tried hitting it with a hammer and prying it but nothing is working. Anybody know of a good way to get the thing off here....Anything will be helpful, thanks.