I looked into getting the Zip Ty tank/pipe setup a while back (when the pipes were still available) but didn't due to their limited availability. I think it was a good decision in my case because If you are truly going to use your bike, and especially if you're going to race it, why use a pipe that is no longer available? I would hate to race my 500 one weekend and crush my pipe, and then spend lots of time searching for a good used pipe that I need because it fits with my Zip Ty tank.
And for those always trying for the most horsepower, I remember Stewart discussing dyno tests with various pipes, but who has any actual data on the result of any testing? I have yet to see a Zip Ty pipe test results, only hear claims made by Ty Davis that is was the same power as an FMF Gnarly desert pipe.