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well, even if you do turbo the KA, it's still not legal. if i remember correctly, GReddy halted their plans of making a 50-state legal turbo kit. so you're stuck on that.
yeah, you are comparing the RB20 to KA24, but the RB25 isn't THAT much larger than that of the KA. it's only .1L.
you've also got to remember that RB series engines are known for a bad #6 cylinder. so you'll have to throw that into the equation.
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