This has such a vast dynamic, it's hard to completely answer.
Three things stick out.
First, the obvious. In order to have through hull anything, the temperature needs to be quite low, this means mixing the exhaust gasses with cooling water. With reversion with aggressive camshaft grinds, this could be catastrophic, so it should be said that through hull exhaust, unless extremely exotic, limit camshaft choice.
Next, look at the temperature of the actual exhaust with a water jacketed header or log and an actual header, never mind the fact that an injected header puts water right at the outlet of the head (goes back to the reversion discussion).
Lastly, there is a pretty substantial argument for safety and sound, you can't get anywhere near a header pipe after a hard run, injected or dry. Whereas you can lay a forearm on the center riser or jacketed headers.
I know this does not answer where you were going, but should be enough to get the conversation started.
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