The metal does keep the air cooler, and the inner wall is smoother so the air is less restricted. They ussually come with a K&N or something like a k&n. I dont know what the 3.8 motor is like but on the CAI the air filter is mounted completely inside the fender wall which sucks in more air and isnt restricted by the air box. The air is still coming from the fender wall though. It should help on a 3.8 but i dont think it would give a huge improvement.
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98 Cobra, CAI, Flowmasters, o/r h-pipe. 4.10s, Hurst shifter.
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