I have a 2011 Road King FLHR and currently have the HD Stage 1 air intake on it. Going to put a set of 4" Rinehart Slip ons on it next week. Have no other mods to the engine and was wondering if I need a tuner or not since I am only doing slip ons and not a full header system? Their website says that there is no remapping necessary for 09-11 models with their slip ons. Any advice greatly appreciated! Thanks.