You might try these http://www.newspeedmaster.com/html/epco_mufflers.html I think they ship to the UK. For more pictures of the pipes, you can see them here, http://sarasota.bizland.com/epco/mufflers.htm#7

I have Epcos on my America and am very happy with them.

Let's hope there's intelligent life somewhere in space 'cause it's buggar all down here. -- Monte Python