Red, tbh I don't think the problem is to do with the can, even though it was worse with a straight thru pipe. I've consulted with Mike (Falcon 269) about this, he suggests looking at plugs/plug caps/HT leads first, which I will have checked/changed when I (finally) get round to taking it in. But I've had bikes with those sorts of problems before, and it just doesn't feel like that, you know? Plus, with plugs/coils breaking down, I would've thought the problem would be worse higher up the rev range?