Apologies if the information i'm about to ask for has been provided before. I've been scouring the posts and can't find what i'm looking for. I've just purchased a 4.1 slip-on and want to know if it's necessary to put any exhaust sealant between the joints at slip-on/mid-pipe, and mid-pipe/header? Also, for those who've bought them, do you use the stock mounting bolts that come with the bike or did you get provided with some with the slip-on? Mine came without.