[Halon]

I also don't understand the appeal of such a large TB. A 64mm I can understand, a 75 seems a bit overkill for the amount of power 99% of us ever plan to make.

But again, I don't know much about Evo X's. It was mentioned larger TB's are good because idle control is done by opening the butterfly. Why does that make idle control easier? In my hollow mind, I'd think a larger butterfly would make idle more trickyas you're "gain" has essentially gone up. With a much larger opening, with every little change in butterfly angle, the percentage of difference in quantity of air making it past would be increased quite a bit. So your resolution wouldn't be as good anymore. Changing the butterfly by 1* on a 58mm vs. a 75mm is quite a difference in air quantity.

Again, just how my thinking works in my mind. Not that I'm right or wrong, i just find it interesting that a much larger TB would really offer better idle control simply because it's larger.