I took the passenger side one out a few months ago when i put my CAI in and have not had any problems. Maybe a tick or two lower temps, but nothing much.
I think the passanger one is there to deflect air into the air box so if anything you should leave the passenger one in:dontknow: this is just what i got when looking at Kevan's truck
If you plan on hitting the triple digits for more than a quarter mile,I would leave them in.They are there for high speed air control (aero) and under the hood area.
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