reflect the heat, dont trap it in.....
get the stick on heatshield stuff and do the area around the turbo with it (also, a heatshield w/ the stuff lining it is a must, too....
i also have the thermotec turbo blanket & the top 1/2 of my DP wrapped, and it works extremely well. very little radiation of temps.....
ps- trim the stocker, or the cusco and it fits fine (not hard to do)