You guys could just make a heatshield out of a Rubbermaid can or (as someone recently discovered) a mailbox!
I'm going to build one here soon and run some ducting from the bottom of the bay up to the filter to help cooling. I agree, once the car warms up all that power is drained and the car struggles. I don't like to rev my car until it is completely warmed up, but I did the other day and *WOW*, big difference cold. It likes cool mornings also.