the super tuner is not "on" your bike, it was used to "tune" your bike. adding another tuner will not give it more power, that has to be done with adding stuff, for a lack of a better term!! building the motor and then using the se tuner to adjust accordingly
If your bike is properly tuned with the Supertuner you will not get anymore power. I think tuners are better with certain devices thus getting more power out of one than another. The PCV is a tool used to tune your motor just like the Supertuner. The difference is a Supertuner tunes/ programs your ecm the PCV tircks your ecm into making adjustments. It has to be plugged in at all times and creates an extra electrical component to fail along with connections (to ecm). If I already had a supertuner and was not happy Id look for another tuner not another tuning device especailly a plug in tuner.