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I was in the same boat as you originally wanting flex fuel and around 600 whp. Ended up sticking with 93 and upgrading the camshaft. Save your money on the extra fuel system unless you plan on upgrading pistons and rods in the future.
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Procharger P1X, CSP Big Boy Cam, CSP Headers, LT5 Throttle Body, MSD Intake, LT4 HPFP, LT4 Injectors, JMS BAP, 93 + Boostane - 750+WHP
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