Interesting bit about your post Tony is that at least 2 of the posters ARE serving traffic officers-and neither of them made and negative comments-read into that what you may.........

I used to have carbon cans(Ducati Performance bought cheaply secondhand) on my ST4S but it was too LOUD so changed back to standard-I don't think I miss the 2bhp! I don't know why-as an exhaust designer you may-but the ST range are much louder on race pipes than the 7/9** series-possibly to do with pipe length?
John