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Experimotive

Maxwell’s Subaru-based FWF package evolves.

By Rick Lindstrom


It’s only been five years since Gwen and John Maxwell acquired the assets of the Subaru conversion concern NSI, and created Maxwell Propulsion Systems. The company has made several significant improvements to its line of aero engines, recently boosting power output beyond the original 165-horsepower MX1 to the new 205-hp MX2. Both engines are based on the EJ25 four-cylinder Subaru engine—normally aspirated and electronically fuel injected—the extra power for the MX2 coming from a new long-stroke crankshaft. But the big news is that Maxwell is working hard on a turbocharger package for each engine.

Maxwell goes well beyond simply bolting a few things to an auto engine, proclaiming it an aero engine and then putting it in a crate for shipping. Every MPS engine is completely rebuilt from the crankshaft outward, blueprinted and carefully assembled using only the highest quality components available. This is all done with the realities of continuous,…


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