You know I'm no hooligan and I'm all for being responsible, but I must confess I do have a weakness for a nice, authoritative, rumbling exhaust. Which makes me wonder: what makes any given pipe legal for road use in Australia, and in NSW in particular? I mean, is it like with helmets - a particular standard that any item sold here has to be certified against and carry a sticker of approval? I imagine not, because I know that unlike helmets, many people order their pipes from overseas... Or is there just some dB limit? In which case, how is it enforced in practice? I do want to be road legal... btw, this is not for CB250 - I'm thinking about my next bike... pretty soon now!