Norman Hyde the triumph twin guru from Uk had an article in a mag recently on a efi bonny he changed the pipes and took out the snorkle and installed a bellmouth then he re dynoed the hp increased by %13 and the torqur by %17 not a bad way to increase power
i just installed the short slash cut tors and re mapped took out the snorkle and opened up the coverplate to the size of the airfilter
i dont know if top end is any better but it sure revs quicker through the gears and sounds a hole lot nicer