first thing: do a compression test and then a leakdown test. that will tell you if you can go turbo or not.
if you can, then chances are the KA route will be *marginally* cheaper. The SR is really not a cheap conversion, since you're spending $2500 or so JUST TO GET THE MOTOR. That's $2500 you're not spending on intercoolers, piping, turbo, etc. But honestly, for ~250-300 hp, the price is roughly the same. Seriously. Don't let anybody tell you one is way cheaper than the other. It doesn't matter. Taking the car to this level is NOT a cheap endeavor. Before you know it, you'll be adding more power, and going even further. Oh, and you NEED better tires/wheels/suspension/brakes before you add 50-100-150 hp. Trust me. My Z brakes have saved my ass more times than I can count.
Eric
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2002 Mazda Protege5
1989 S13 w/SR20DET (sold)
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