I have a 15 and just installed a screaming eagle intake and Vance and Hines headers and 4" rhinehearts mufflers. I just dropped off my bike at dealer for a remap which I am told I need. My question is will this make any type of difference? Just seems like a waste of money I am hearing mixed things if the remap makes a diff? Never hand it done before so just looking for comments. Will I gain any horsepower ?