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The 964 Carrera RSR reflected Porsche's return to production-based GT racing dominance. Based on the only slightly less-potent RS 3.8, the RSR was a full-bore lightweight Turbo-bodied beast aimed at major European GT contests and the North American Supercar series. The rear of the 911 Turbo's wide body was occupied by a model-specific Type M64/04 3.8-liter air-cooled flat-six, naturally aspirated with 11.4:1 compression, lighter pistons, dual ignition, new intake manifolds with six individual butterflies, dry-sump lubrication, and Bosch electronic fuel injection. This potent engine, essentially a 3.6 with a 2-mm bore increase, gave as much as 375 horsepower—perhaps more—and 284 pound-feet of torque, depending on class restrictions.