Why would the Z4 suddenly have a manual transmission option? Toyota is the obvious choice. The BMW Z4 and Toyota GR Supra are fraternal twins created in collaboration between German and Japanese manufacturers. They share the bulk of their mechanical components, such as engines and gearboxes. However, while the six-cylinder 2023 Supra may now be chosen with a six-speed manual transmission, the revised Z4 retains just an eight-speed automatic transmission.
