I bought a 2014 Ultra Limited in May. I put Vance and Hines High Output Carbon Fiber slips Ons on the day I bought it. I'm wanting better sound and performance. I plan to do a power commander also or screaming eagle tuner. What I'm wanting to know now is what true dual headers are the best. Should I stay with Vance and Hines and go with the power duals? You thoughts please. Thanks in advance.