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Anecdotal info, for what it's worth:
My 01 s10 (4.3L) is equipped with a scangauge (that shows me IAT) and an aftermarket intake with heat shield & mylar/bubble insulation. I can tell no driveability difference whatsoever between heat shield & insulation on, 50 degree farenheit intake air, vs. filter mounted straight to the MAF which nets 150 degree farenheit IAT on the same day/same tank of fuel.
However, the less restrictive full intake DID make a huge difference in driveability vs. stock intake... not just on the butt dyno, the scangauge showed an immediate increase in fuel flow GPH at WOT compared to stock intake, which to me indicates more air's going in there too (fuel trim % did not change)
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Work From Home mod has saved more fuel than everything else put together.
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