[gumby79]

Before I wraped my exhaust manifold and turbocharger I was mesuring component(not air) temperatures @250-300°f after 1 hr @65mph, can't tuch anything ,with an IR temp gun...
after 100-150°f at the top of a grade after pulling900°f EGT for 10min and 650-800° f for the previous 30min with a grill block on my 1st Gen Cummins during summer. Pop the hood and grab a hand full of turbo snell and hold on to it warm but not bad . More power 1/2 as much lag, doing more with less (more efficient) . (You have a waste gate to solve lag but this would help) the components under the hood are designed with the specific heat zone of its intended use. I would say 350°, plastic starts to soften. So this would be my upper limit. IAT is no good for me and you, for reading the under hood temps . Our turbocharger heats the air when it compresses it. Then cools it with the IC we blocked .