All depends on what your after. I have three CVO's. A'10 CVO Street Glide, '10 CVO Ultra, and a new '12 Ultra. The '12, I did Vance and Hines X pipe with RC components slip ons. The '10 both have D&D 2 into one with a ghost pipe. '10's also tuned with a SERT. The "10 Street Glide has a,"quiet", baffle and the Ultra, the loud one. The '12 I has a Zippers Tmax with auto tune. Heres the deal. Without question, the Ultra with the loud baffle is the best performer. Sound is bad ass. But annoyingly loud on a long trip. That is to others. No one wants to be behind me in a tight group. Music to my ears-HAHA. Quiet baffle is only slightly quieter, but seems a little less on HP. Not sure this would be true if I were to dyno both bikes, but seems that way. On the '12, just wanted to try something different. Nice sound, but no where near as loud, looks good, and runs great. The Tmax has a decal pop cutout feature that is very nice. Just about did away with the decal pop. '12 not as much power as the '10's. Bottom line, I'd do the loud D&D 2 into 1 with the ghost pipe and the Tmax and auto tune on my next one.