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The stock fuel system is better than what most people think, if anything in the fuel department get a FPR (fuel pressure regulator) and than i would just build-up the valvetrain. The bottom ends are pretty strong, but the valves will float at like 7000-72000 RPM, no point in having an upgraded valvetrain though if you can't rev high enough to use it so than you need a new ECU or have one chipped. So many ways to look at this.
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