oh god one of these questions, jk, LOL
cold air won't add squat, that is significant anyway, neither will cat back exhaust, and by significant I mean dyno tested at the rear wheels gain of 10% or more
so we are left with software vs hardware, well a lumpy cam will give you crappy idle if real power is what you are after and it's a good weekend spent on the swap, but anyone who knows a wrench from a screw driver will tell you that a cam swap alone is as effective as sucking on a titty through a sweater, in order to do it right you need to marry the proper valve springs etc in the attic of the heads, then there is the chip, ah yes fooling the engine into running a certain way despite of what the sensors map may tell it, [ahem] or as the glossy marketing ads say "freeing up horsepower", that's it
tongue 'n cheek gentlemen, tongue 'n cheek
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