I just installed the vance hines straight shots on mine,with the velocity hot tips. everyone tells you that you have to rejet your carb,but you dont if you dont change the breather, get on VROC.org (Vulcan Riders and owners club) join it if you havent allready,go to the discusion boards and these guys can help you find what ever you need, it is a world wide club,i am in it, semicrazy is my nick name, Anyway you can find out anything you need to know about your bike there,because there will be someone who has done the same thing.I ran mine straight for 3 days,no baffles ,had to stick them in yesterday just to loud for normal riding,,, never thought iwould say that,,, chris