Could use some advice on installing a d&d fatcat exhaust on my 06 roadking. Am I right that the black bracket and the very large hex head bolts are there only if you need them? Not sure I need to use them when installing on a 06 roadking. If I do need them where does the bracket mount to the bike? There is the small bracket on the header pipe. Is this meant to be used always or only on some installations.