Not true if you have a good canned map, like the one's Fuel Moto develop. I've never had a dyno tune and the performance on my bike is excellent. Could it be better? Possibly, but foor me it isn't worth spending $C's to extract another few 10ths of a HP from the motor. YMMV.

If you need more info, call Jamie at Fuel Moto. He sells both the T'Max and PCIII.

 

After a couple of years running a PCIII, I just installed a Thundermax. My bike has never run better, but it ran pretty good with the PCIII and would probably have run better had I had it dyno'd, but I make too many changes to go through that every couple of months. I vote for the Tmax w/autotune, but I think set up right the PCIII can be just as good. Looks like it's your call! Good luck.