Toyota appears to be testing a potential Supra GRMN, an ultra-high-performance version of its sports car that’s rumored to be arriving next year. This hot variant is designed to compete with track-focused sports cars like the Alpine A110 R, Porsche Cayman GT4, and BMW M2 CS. The prototype displays more aggressive aerodynamics, featuring a new front splitter and raised rear wing. Upon closer inspection, one can see new lightweight wheels with Michelin tires and larger brakes. The body appears to sit lower on its suspension, which is expected to be completely recalibrated for the GRMN model.
The key question lies under the hood, where the Supra’s BMW-based platform might hide a BMW M powertrain for the first time. The current six-cylinder GR Supra uses a 250kW turbocharged 3.0-liter inline-six engine (known as the B58). This engine is found in various BMW models, including the M340i sedan and X7 SUV. Rumors suggest that the GRMN could adopt a more powerful M engine, potentially the S58 engine used in the M2, M3, and M4 models. The S58 engine offers different power levels, starting at 345kW and going up to 375kW and 404kW.
The existing GR Supra offers both a six-speed manual and an eight-speed automatic transmission. The availability of the manual transmission in the GRMN might depend on its compatibility with the more powerful engine. In any case, it will work in tandem with an electronically-controlled limited-slip differential, contributing to a significantly enhanced driving experience.