I have an 11 ultra. I have a friend with a hopped up 2010 or 11 don't remember cvo and he told me I could have his stock mufflers. I was going to get the fullsac baffleps and put them in his Muffs for my ultra. Will they fit my bike and what size baffle should I use? 1,3/4 or 2" or 21/4"? Stock bike probably a k and n air filter and maybe a fuel tuner next year..I hear that my stock computer should adjust enough to get me by but I know I still will b lean. If I drill out the cat will I void my 7 year warrany?