Yeah I have one and love it. This is a stock motor and I have not dyno tuned it. It's a carb bike that I rejetted myself. It does have lots of bottom end torque. I have gone through a lot of exhaust systems over the years and this is one of my favorites. The other pipe I like a lot is an RB Racing LSR that I had on my last bike that was totaled along with the bike. here is a short video of my bike.
http://www.youtube.com/watch?v=Q6T0ze_IUBY