Iwant to buy either a Speed Tuned 3 port .12TZ, or a regular 5 port .12 TZ (non-speed tuned). I have a regular 3 port .12TZ in one of my trucks right now and I love the power, but it is in need of a rebuild so I want to upgrade while I'm at it. Are the speed tuned engines that much better, and would it be better than a 5 port motor? I am looking for high RPM power so I am leaning towards the 5 port but I hear so many good things about the speed tuned engines that it is tempting.