the GT28RS .86 is a great match for this engine, especially stock internals, I made 495whp/410tq at 10psi with a very restrictive exhaust setup. if you're built it certainly depends on your power goals. Personally I never wanted more than 600-650whp max, I built for reliability. I'm quite confident the disco potatoes will get me over 600whp on 93, the GTX has some small improvements if you aren't running much boost, but once you get past ~18psi they are different animals all together.
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