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The hatch could be aiming for a sub-four-second launch to 60 mph.

Ford could be working on a limited-edition Focus to slot above the current high-performance RS flagship.The hatchback would be labeled the RS500, according to a Motor Mag report, reviving a 2011 package (pictured) sold in Europe with a run of just 500 units. The original RS500 accelerated to 60 mph in 5.6 seconds, but Ford is expected to aim for a sub-four-second benchmark with the new model.

It is unclear if Ford's engineers can easily squeeze more power from the RS' 2.3-liter EcoBoost engine, which boasts 350 horsepower and 350 lb-ft of torque. The numbers are good for a zero-to-60 mph sprint in 4.7 seconds.

If the EcoBoost mill is already close to its maximum emissions-compliant output, engineers will presumably focus on weight-saving tweaks to help improve performance. Carbon-fiber bodywork, lightweight brakes, extensive aluminum suspension components and a stripped interior are expected to save a few hundred pounds. The company could also implement carbon wheels, as featured in the GT supercar and Shelby GT350R Mustang.

The rumors have yet to be independently corroborated but an RS500 would not be a surprising addition to the lineup a few years after the standard RS has been on the market.