A couple of things I found in the past when testing out different types of intakes:
1. A cone off the TB will show higher temps while sitting, but as soon as you start moving the air temps will drop significantly, as much as 20* within seconds, and will equal the temps of a CAI.
2. The flow between a CAI with one bend and open cone off the TB showed significant gains for the open cone. The MAF increase was over 1000hz, and actually caused me to outflow an LQ4 85mm MAF (2.8 pulley installed).
3. MAP values increased an estimated 20kpa using open cone vs. CAI. I am unsure how much the actual increases were because I exceeded the 200kpa limits of the 2-bar MAP when I ran with the open cone. With CAI, the MAP never exceeded 190kpa, and averaged 180kpa.
I saw an increase in trap speeds of 2mph with open cone vs. CAI. To me, there was a clear advantage to more flow with open cone on a modified car. Whether there are any gains on a stock or lightly modified car is questionable.
