I have a 2007 pred 500. I want to get ride of the stock mikuni 42mm bsr and go to a mikuni flatslide but I have no clue what size to get or what style. Any suggestions woulb be helpful. So far I think I want one of these but I'm not sure which one is the right one. Babbittsonline.comI haven't done much to the quad just a CDI box from procom and a Rathracing K&N set up that eliminates the air box.