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You can use an Si or an HF distributor. this is becasue the MPFI distributors have a Cylinder Position Sensor inside the distributor and the DPI ones do not. the reason for this is because the DPI manifold injects gas into a common plenum and gas goes to whatever cylinder has an open intake valve. the MPFI uses the cylinder position sensor to determine at what time to squir fuel into a cylinder at a given point in time.
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