How would you determine the ideal length & diameter tubing for a custom CAI for LS2? Would you assume the factory setup was ideal or is there a calculation that you can run to determine what is optimal?

I am trying to run one on my TBSS, but I'm concerned that the pipe diameter and or length will ultimately hamper performance.

If you were able to design a "ram air" intake how would you factor the ram effect into this equation (ie is there a forumla for speed x intake diameter x some coeffiecient=ram effect (cfm) or something like that?

Its been a long time since physics and my knowledge ran out a long time ago.