I am on my third zx10r, due to two of them being stolen. Anyways my 05 had a fully muzzy titainium (loved it). Then the 07 was stock and now I have anouther 07 stock. I played around with my 05 and took the can off and drove it with just the headers and pipe to the can. Lost tons of low end torque. I guess my real question would it be possible to keep torque if removed the catalitic converter and cans and used the some of the portion of the pipe that connected to the cans as an exhaust. I see all these moto gp styling systems and wonder how they make low end torque?