I recently picked up a set of 027-7853 slip-ons for my stock 05 FLHT and I'm wondering what part #'s I need for the discs, re-packing kits, slash cut end caps and what the best set up is.(# of discs, air cleaner, etc.) When I got the slip-ons there were no internal discs in them! Can this cause damage and they seem a little loud? Where can I purchase this stuff?