Just kidding. I get what your doing. I really wouldn't worry about if you eliminate heat by wrapping or jet coating the exhaust manifolds, downpipes and parts of the turbo.. you shoud see a dramatic change in temp under the hood. This would be equivelant to what you were goind to do anyways. I say if you got the engine out or have access to them... do em. Wrapping the IP won't do that much (in my opinion) but wrapping the DP's would be a good idea.
One of these days I'm going to have to do a tech on this. I already got the wrap just don't got the DP's just yet. Give me a month and I'll post something with some comparisons for ya.