I have a .21 3 port standard head in my kyosho very nice engine i love it. I have a Dynamite 007 Ht exhaust on it now, but soon im putting a JP-3 on it. I have a few questions though.

When this engine goes im thinking about getting a .21 7 port turbo head, i mean what exactly does the ports do and the turbo head. I understand that the turbo plug is tapered and the motor has more ports but what does it do to make it run so much better. The cost of the .21 3 port is $125 and the .21 7 turbo head is like $210 so i wanna understand all this before i go spend the money. One more thing is a motor with more ports and a turbo plug harder to tune then a standard head and less ports?