Cheers slater, the bit that makes mosts sense to me is the silencer where you described if the pipes go into the side of the silenecr the gasses bounce back. It does makes sense to me now.
Barry, i know thats one thing i would miss is the sound of a 126, do the BIS's sound much different to the aircooled? i seem to think the aircooled sound, sounds better. If i did get a custom exhaust i would keep the orginal of course, and swap them accordingly.
Thanks
Chris