got round to fitting my precat yesterday and a second hand normal gsi cat as my coupe had the all in one type with the pre and normal cat joined. after getting it off found that the pre cat was smashed up in to loads of pieces and the main cat rattled as well. So on with the new cat and precat 20mins later still messing about with the stupid clamp. got it all sealed and off for a drive. and WOW what a difference the noise has got deeper and louder and my car feels fast again alot smoother alot more power so i suggest anybody who has not got one on there car go buy one NOW!!!!