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My car had one (cold-air pickup) when i bought it, so I can't vouch for the gains although I'm sure they are there. It works off a basic principle: the colder the air, the less space between the molecules and the more you can stuff into your cylinders. It used to be an old racers trick to put a bag of ice on the intake manifold before a race. Same concept. Not sure which brand is best. Hot Rod tested Fram's Air Hawg system a while back and it showed definite gains. K&N & Moroso make ones for F-bodies.
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