The car is already getting air out the fender...do a search for the ram air...I know it kills gas mileage...on a car that doesn't get good mileage anyway. Personnel I think the car has a decent air intake...why have it pull air out of the hot engine...it is pulling from the fender just over the wheel...can't get much cooler than that...
Some sort of shield or enclosed intake is preferrable to an open intake- There are many solutions out there, including the DTEC shield. Albeit a bit overpriced, it works very well for me. I hollowed out all of the stock feder draw tubes, assemblies, etc, and there's a good amount of cold air coming through and into the shielded area.
From doing extensive temperature testing, air coming from the stock 'draw tube' in the fender is on average +10F degrees over ambient while driving, or -10F underhood while at a stop. From looking at the way air is flowing into the fender, I have the feeling that warm air from the radiator is mixing with the cooler outside air and getting drawn into the intake. Supposedly the GMK intake kit is -2 below ambient at drive, and +2 over ambient at idle, according to OBDII...
(To finish answering your question) Remotely acquiring air for the filter outside of the stock location would be preferable to drawing air from the stock location. Remember that by placing the location of air intake that low, you may or may not have issues when driving into deep water, etc, depending on your setup. Worth it, IMO? Yes. Just not if you drive through deep puddles/road floodouts.
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