Thats a good point Ian, its radiant heat therefore blowing air into the engine compartment would not have a huge effect, and so the foil is supposed to reflect the "radiation" and prevent the walls of the airbox from getting as hot.
What about those muffler heat tapes/blankets, those are also designed to prevent heat absorbtion and can further insulate the airbox.
I suppose a combination of all these things including more air blowing out the "conventive" heat as well in the engine compartment should all help.
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"It broke because it wants to be Upgraded  "
2012 Porsche Performance Driving School - SanDiego region
2001 Boxster S, Top Speed muffler, (Fred's) Mini Morimotto Projectors, Tarret UDP,
Short Shifter, Touch Screen Dual Din Radio, 03 4 Bow glass Top (DD & Auto-X since May 17,2012)
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