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I don't think cold air intakes actually do anything, usually the factory air box is pretty good at pulling cold air. Often times the aftermarket "cold air intakes" actually end up sucking hotter air from the engine bay, and you have to shell out 300 bucks for them.
Alternator pulley is not worth it because it'll reduce your voltage at idle. Water pump and power steering pump are always worth slowing down a bit, ideally removed completely but that's a lot of work.
If you have the lip spoiler on the trunk already, I wouldn't bother with more aero mods.
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