Stock head pipes, Rush slip-ons with special baffles and PCIII usb (preprogrammed)from Fuelmoto are the kind right now....Top HP and TQ
True duals look and sound good but you loose performance....check the numbers on the Fuelmoto website.............
If you aresearching for performance and a great sound, check out the V&H Pro Pipe BP. I put one these on my CVO Springer and they sound better than the V&H true duals on my RK and better than theV&H Staggered Short Shots on my wife's Low Rider. In addition, you get the advantage of better performance from the 2 into 1 exhaust. Something to consider....
I had V&H True duals with turn down tips and just changed to Rhinehart true duals. I like the Rhineharts better. The Rhineharts have larger diameter head pipes so more output. They sound deeper to me and not as loud. Easier to hear radio at highway speeds. Picked up a little power after the change, but both are good pipes and you can't go wrong with either.