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CAI Is better because it intakes colder air = denser air, better for performance. probably the best idea. I have an SRI because I just didnt want to pay the extra cash, risk water intake, and possibly do some cutting to get the tube down to my wheel well. (I wish I would've known that a perfect little hole is already there. It was where the old resonator was, and it wouldve been perfect for a CAI.)(BTW: resonator I'm talking about is just a plastic box that is attached on the factory air hoses to quite the sound. Its not necessary at all. There are other kindas of resonators, like for exhaust. Those quite your exhaust down, and make it not sound like a weedwacker when you install a perf exhuast.)
intake manifold is the big metal thing that your throttle body sits on. This is the thing that deals with air and fuel going into your engine. Sorry I cant be more specific, but thats the extent of what I know about it. Aftermarket ones are very pricey. And I know that intake manifolds can get all sorts of nastiness in them, carbon buildup and crap.
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