I dont know about the WRX stock FPR but the 255lph over-rides the stock DSM one causing you to run real rich - thus needing to buy an AFPR. Maybe it doesn't do this with the WRX FPR? But from experiance, I'd get the 190lph and re-wire it directly to the battery to increase flow. Its something to think about...
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Turbo is a decent with modification.
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