It appears that there are several pretty good alternatives out there with more probably to come. One thing I haven't seen are any weight comparisons with the stock pipes. Haven't seen any dyno runs or anything relating to power from the manufacturers either. I recall, from when I was first equiping my Valkyrie, that one of the very major aftermarket pipes had a significant power penalty to accompany the loud sound. Anyone here "in the know" on any of this? Would be good info. to share.