I'm sure there is another thread somewhere with my question but Ive searched and searched and could not find it (Little new at this). I have a 09 xb12r and want to build my own muffler for it. I don't want to use the stock exhaust just in case my plans don't work out. I would like to know what is the difference from xb9's and 12's in terms of size or mounting brackets. Also between years. Any help would greatly be appreciated.