any tuned race cilinder with custom exhaust pipe will definitely give the most power save for a few tuners who got the same results with a commercially available pipe.
the best tuned cilinder & exhaust pipe combo is yet to be made, somebody will always come up with a better combination if given time & lots of money.
so far i have great results with my tuned MHR Speed (mina) & tuned MHR Team exhaust pipe, until i canm afford to buy a custom exhaust pipe i will continue to tune my current exhaust to get the most power from my tuned cilinder.