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What if you just hot boxed the entire engine bay?
I know this sounds insane, but hear me out:
Get coroplast underbody panels, affix some aluminum foil to them facing up, or buy the aluminum one sold on Insight Central. Then you do what Ecky did inside his front wheel wells, more plastic sign crap in there with aluminum foil. Get some extra weatherstripping for the hood, and switch to an upper grille block + partial lower grille block. Cool air comes in the bottom, only the hot air at the top ever makes it to the stock intake thing. Also maybe use some aluminum around the exhaust to exhaust tunnel gap below the first cat to seal the air in down there. And aluminum foil on the underside of the hood.
I bet you could get air intake temps of at least 120°F and still have the stock intake setup.
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