One thing to consider, air has poor heat transfer coefficients. Won't heat up tremendously at velocity due to convection or heat soak, especially if it can suck air from a cooler source rather than the engine bay. I thought the intakes were a plastic or molded non-metallic compound, thus further insulating the intake charge from tremendous heat as compared to an aluminum intake (thermal conductivity value nearly 250 vs. air at about 0.025). Heat soak would make initial startup charge pretty hot, but once cooler, and hopefully outside, air is pulled through, the air charge will cool down considerably.
But the insulated cover definitely isn't helping the engine stay cooler overall. But maybe saving the paint on the hood temps?
It'd be interesting to see the actual temps.
2010 2SS/RS Auto, Sunroof, Engine Cover. Transformer Edition package.
2013 ZL1 ragtop #5478. 1 of 54 CRT M6 'verts.