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if you're going to go turbo, don't waste your money on a CAI or header. uhm, no CAI touches the O2 sensor. the O2 sensors are in the exhaust. Oh, and if you ARE going to go turbo, don't waste the money on a cat-back, either, as it will need to be replaced when you go turbo.
if you're talking about the MAF...okay. as for parts....check the tuning guide at the top of this forum.
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