Biggest and baddest engine for a Mazda 626?

What's the biggest and baddest engine that would go in a 1995 Mazda 626? It comes with a stock V6, and I'm not looking for a V8 and shit, just looking for something with a lot of HP. Would it be something from JDM or...?

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All they are is just supercharged engines, right?

No actually the KLZE is the upgrade for your car. The only difference between the stock v6 and these are the Uppper end "Head intake manifold, and throttle body ect". The rest is "Basically" the same, But you gain a buttload of power out of them

I'm wondering if it would be cheaper to just buy all the aftermarket parts or buy the whole new engine?