well, I dont know about you guys...but most of the heat on my hot side I/C piping comes from the compressed air coming from the turbo...it just seems to me since heat wrap would prevent that air from getting out(just like a header or DP) it would keep the intake air hotter....now this may not be the case with all of you...depending on how close to the exhaust your I/C piping runs...but for me, since my turbo is at the back of the engine...the DP is over a foot away from the hot side pipe...it seems much more effective to heat wrape the DP