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Hard to tell
I made mine in concert with getting the ScanGuage, so technique over shadowed aero technology. I may take mine off for a week, and see if anything changes.
However, I recent added some baffles that restrict cold air getting to air filter inlet. Under hood air definitely has big effect on IATs now, and mileage was increased as a result. If I do take it off, I expect a drop not due to aero losses, but cooler IATs.
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