I beg to differ, this is an roadcourse race car. 20 minutes is the minimum track time it sees a stint. Heat soaking is the reason I've increased the size of the intercoolers 3 times and vent the radiator air straight out the hood. The intercooler would slowly heat soak and the intake temps would rise past 130*. I'm currently running a 27x12x3.5 thick core on a 3L V6 and it can barely keep up. A slightly taller one and 4 inch thick is my next one.

Yes I believe in airboxes (I've built one for the race car, uses a hole drilled in the headlight for cold air, removed it after testing), but my own personal data shows that with a properly sized intercooler, it didn't make any difference, driving in traffic, at the drag strip, at the autocross, or WOT for 20 minutes between pit stops. The air temps entering the engine (my computer logs this because it uses this temp to calculate fuelling) always stay near ambient under low load, or no more than 20* above at high load, even the temps going into the air filter (MAS had it's own temp sensor) rarely got over 90* in traffic with 75* ambients. If you want to see heat soak, shut the engine off and log manifold temp, it will rocket to ~200*.

Now, I have yet to datalog my truck with my thermocouples, so until I do I can't say either/or besides what I've seen, which is what I posted. From the data I have, though, I'm doubting there will be a significant manifold temp difference Between my shielded open filter and the S&B intake I have sitting in a box in the garage somewhere. Only thing stopping me is having to weld the bungs to the intercooler piping and intake, as I'm out of them. Time is also pretty scarce these days, now that I'm trying to get my race engine rebuilt before next season.