Is the Toyota Supra GRMN built with a powertrain by BMW?

Is the Toyota Supra GRMN built with a powertrain by BMW?
According to various reports out of Japan, claims that a limited-run version of the Toyota Supra will sport the same powertrain as the upcoming BMW M3 and M4. According to Carscoops, the Toyota Supra GR MN is powered by a BMW-sourced 3.0-liter six-cylinder with a single turbocharger and rated at 382 hp and 368 lb-ft (499 Nm), figures that help it hit 62 mph (100 km/h) in under four seconds.
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