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The S65 uses a PWM pump. The radium hanger kits are for use with fixed flow pumps and traditional fuel pressure regulators. It has always been possible to hang a larger fixed flow pump in the tank, but that is not the end of the matter. Integrating it into the factory fuel system has been the issue. High power supercharged cars have turned on a secondary fixed flow pump only at high boost, so it supplements the stock pump.
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