Just wondering if anyone has fitted a cat back exhaust yet on the convertible? I had mine fitted on Thursday - looks & sounds great. Had to remove chassis brace to remove standard exhaust but put back on once new exhaust was fitted. First real drive was to Goodwood this weekend & when on bumpy roads sounds like there is a knocking sound. I think it must be the new exhaust touching the chassis brace when on bumpy roads as there will be a small amount of flex in the exhaust due to the rubber mounts. I will see if I can adjust it as annoying- I don't think it is doing any damage.