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A balance between more power and gas mileage.
Hate to say it but with such a limited platform your best bet is nitrous. You can spray any engine..some will last longer than others under the abuse but if you don't spray too much and too often you won't have a huge problem. And you'll also have the power you want without sacrificing gas mileage.
I wish I could be a bigger help but I know nothing about Mazda's power trains. See if you can find out if other vehicles share that same engine and then look for performance parts for those cars. I know a lot of guys with Crown Victorias look for and use Mustang performance parts because they both have the same basic engine with a few tiny differences. So maybe look to see if the Mazda6 or whatever uses that engine.
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