It's such a hard decision to make: SR vs. KA. I would personally go with the KA on my '91 and try and find another S13 and do an SR swap on that one. I need to get a better-paying job to do all this, but... this is what I'd love to do. Just my .02.
P.S. I'm kind of leaning toward KA turbo rather than SR (parts availability, torque...)
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