You will want to tune the car pretty aggressively. The factory fuel system regulates pressure at the tank before all pressure drops. So as your system flow goes up in the high power, the restrictive plumbing will start to generate pressure drop. So your boost is going up, and your rail pressure is dropping. You stand to loose a ton of fuel pressure differential. So the lower you keep the boost, and the more efficiently you burn the fuel, the more you are going to make out of the fuel system. People have run out of fuel as early as midlow 500s on this car... if its going to take you a lot of boost to make the power, or you arent going to tune it aggressively.. that scenario is where I would say you wont make it to 600 on a stock fuel system.
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