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For a supercharged or turbo engine that makes 300 HP, 114 liters per hour is usually considered the safe area for a pump.
In one of my cars I've run a Bosch external pump for several years; got rid of the intank pump. It can be changed in about 10-15 minutes as it's mounted to the frame. If you need a pump there seems to be plently of room to mount an external below the fuel line in the Elise/Exige.
I'm not saying it's optimal, but with volume that keeps the pressure up I've seen injectors run past thier way past their DC for short bursts without lunching the engine. But the fuel supply never dropped off.
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