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get a used steeda cai, I did for 150 bucks, offa the 389 price tag.
homemade is a nightmare to tune, as well as the dam ebay ones.
I went through the same process with the powrtuner on my old 3800 GM...scanning and then making MAF table changes etc so the fuel trims would settle around 0. After hearing the replies here I'm going to get my K&N tuned or just buy a new package deal. Thanks for the heads up guys....I'm not used to a world of aftermarket solutions yet[8D]
I support you building your own CAI. Its a good thing to be unique.
It'd be easy to do, however I went through the manual scan/tune process on my 3800 GM engine...since the 'stangs have all these tried & tested packages, it'd be soo much easier with similar end results.