The only thing on the list that would add power would be the nitrous kit / turbo. You'd be money ahead to just buy a faster car. But to each his own. Those guys on here who've done the header report back that they didn't gain power ... at least that's what I remember. Cold air, meh, without the ability to tune the AFRs I doubt it would gain power but I'm not certain on that one. At any rate I doubt one could distinguish a power gain with CAI.
I'm just glad I enjoy the small amount of power the engine makes as is. I'm not knocking you. If anything I would suggest the following: 1) Be very selective what you do to the car, don't make it so that your wife doesn't want to drive it. And 2) be selective of the power mods you do because regardless of what you do it is likely still going to be slow. Seriously, you'd be much better off to not spend one extra dime on the car besides upkeep / regular maintenance, and find some ole Mustang somewhere that you can afford. Plenty of effective to somewhat effective mods available for those cars, and you won't get made fun of.
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View my fuel log 2020 Mirage ES 1.2 manual: 42.4 mpg (US) ... 18.0 km/L ... 5.5 L/100 km ... 51.0 mpg (Imp)