Just finished doing the stock airbox mod with a radiator shield. Completetly happy with it as I am saving $300 or so. However, I would like some analysis on intake surface area. I know some of you in school or in engineering can quickly help answer my question....

Question 1)

What is the maximum amt of air that the stock inlet on the turbos can support? If that is not available, how about the stock intake hose. Granted it is a function of intake pressure and temp, but I think it is important to support my second question.

Question 2)

What is the intake surface area of the K&N drop in vs. the dual apexi cone filters.


With that said the "hard" limitation is the opening in the turbos (possibly the throttle body) but we won't go into that. Stock intake tubes provide turbulance, but that is hard to measure. So perfect world which "architecture" is better?

BTW, FWIW the two supra TT drop ins seem to be about the same size as the rx7.


Keep in mind, I'm not interested in the possible limitation of the box of the stock intake as I feel I've alleviated the bottleneck.