Best material for heat shielding intake

[solidONE]

There seems to be quite a bit of heat shielding products out. Most of which contain either a mirror like finish or textured aluminum outer coat. So I figured, I have this sheet aluminum laying around why not try it out? (apparently oxidized aluminum has as bad as 70% reflectivity of radiant heat vs up to 96% for polished surface, I've read)



This loosely attached (double sided foam tape) aluminum sheet doesn't seem to be doing much in terms of keeping heat off the intake. Although surface temps seems to be a good amount lower on the aluminum compared to the plastic airbox.

I'm guessing I will have to try out these specific products to get the job done right. But, I'm not sure what will work better. Most of these product advertise 95% reflectivity or more, but you know what they say about ads...

So what better for this purpose?

Gold foil tape?


Silver foil tape?


Aluminum coated fiber?


Or this kinda thing?


Or is there any way to make the sheet aluminum I do have work for my purpose?