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Wheels: the factory wheels are aerodynamically designed to aid in mileage. If you replace them with anything "sportier" you'll likely lose a few MPG.
CAI: I wouldn't recommend changing to a cai, as the engine is tuned specifically for the air it gets.
Exhaust: I wouldn't recommend this either, it'll juts make it louder.
Sub & Amp: I have 2500 watts of system in my CHCII. The only difference is the added weight. I've added about 300-350 pounds of system to the trunk, so I lose about 3 MPG. I haven't noticed any difference in teh charging system though. It is pretty robust.
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