Has anyone compared the 2 heads side by side? I have and it seems to me the 05 head would be a much better choice for a race engine. Anyone have any input? The ports on the 05 are MUCH bigger. I know bigger isnt allways better. In talking with some porting specialist they have told me the 05 head is the way to go. A few of them even went as far to say throw the 06 head in the trash and get yourself an 05. Anyone got any input?