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Maximize your stock fuel system while protecting your engine with the CorkSport MZR DISI Max Flow Fuel Pump Internals. With well over 2 years of research and development, you can count on CorkSport to bring innovation to the high pressure fuel pump on your Mazdaspeed. With hardening surface treatments, high strength coatings and a machined tolerance that is the best on the market, our pump internals are ready to give you the most performance available for your dollar. These pumps are precision machined, then treated, then coated and then machined again for a perfect fit and an ultra-high efficiency. That difference in the real world is going to be higher horsepower capability, safer air/fuel ratios and the ability to go that much further in the quest for power without worrying about fuel supply.