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I have a similar stock setup, with the airbox intake at the bottom. I blocked that off, cut a hole in the side, and inserted a flex-tube routed to the exhaust manifold. This results in ~100F in the Winter.
My non-lean-burn engine likes 100-110F for optimal FE. Have you tested the range of limits vs. FE and lean burn?
Best FE...
-Rick
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“If we knew what we were doing, it wouldn't be called research” ― Albert Einstein
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