So I am looking to put a new Cat back system on my 15' Challenger RT. After hearing one in person, I'd like to put the SLP Loudmouth II (Model #D31030) on it. Trouble is, on their website, they only make a system for the 08'-14' model years... Now I heard this on a 15' RT exactly like mine. Will this one fit from the factory or would it need slight modification (ex. hanger location)? Does anyone know the difference in exhaust set ups between the 08'-14' RT's and the 15' RT?