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The stock fuel pump couldn't safely support the power levels the L99 was now capable of. The gas tank was dropped to install dual pumps to increase fuel flow/volume. (Hauffe has the same system in his LS2/ProCharger-equipped Pontiac G8 with 608 rwhp.) Also, a change to 80-psi injectors was made to support all the horsepower that could be produced in the cylinders.