[Topless]

I gotta go with Mike on this. I need to see some before and after hard data because it goes against what I understand about radiant heat transfer.

For comparison, 40 degrees is the equivalent heat rise across a highly efficient copper heat exchanger inside a 400,000 BTU gas fired water heater with 1,500 degree F. flames lapping at the copper coils. Water velocity is also spread out and slowed down to maximize contact time and heat rise. That is a very different environment than a Boxster intake.

My initial engineering thoughts:

- The plastic box and intake are poor conductors of heat.
- Intake air velocity is pretty high so not much heat-absorbing contact time.
- High velocity air is a relatively poor conductor of radiant heat.

Best guess: Little if any measurable intake radiant heat rise. This is easily tested with a temp probe at the intake grill for ambient and another just ahead of the throttle body. Compare results.