I have a 08 roadliner which is currently 100% stock. I have decided to upgrade the muffler with a slip-on. I'm a newbie but understand that most guys don't need a fuel pack if they are just installing a slip-on with no intake mods. Is this true for the roadliner? Will I experience more popping and backfiring due to a lean mixture? I am leaning toward the d&d brand slip-on and was hoping somebody had installed a d&d on a roadliner with no other mods. Thanks!