Had VH BSS with the x-over power chamber and swapped with a Cobra 2n1. Their was a very obvious performance improvement from low to mid range with the 2n1.

 

I like both of them as far as looks, sound, and performance. I am running the Pro Pipe HS on the Fat Boy with a race baffle. Gives up a little off the bottom due to the short baffle, but runs well across the board.

 

Both the ProPipe and TH are great for performance and sound, but I've seen lots of Thunderheaders with finish problems (both chrome and black) and I think the Road Rage long is the best looking of them all.