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If $100/hp is not too expensive for you, go with a CAI, catback, midpipe. But chances are that is too much for too little. There's the Greddy turbo, but your warranty will be void. So there's nothing much that fits your criteria, because of the emissions restrictions by Mazda.
If you consider handling to be 'performance', there are sway bars, springs, etc.
And search.
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