The BMW Z4 M Roadster (E85) came from the factory with with a 3.2 L S54 inline-six making 338 horsepower and 269 lb-ft. However Manhart calls this roadster a “MHZ4 600” because of the increased power from a powertrain swap. Instead it’s powered by a 5.0 L S85 V10 from E60 M5 stroked to 5.8 liters making 630 PS (621 hp) and 640 Nm (472 lb-ft) of torque. Power is sent through a M3 E92 six-speed manual gearbox with a sintered racing clutch to a E60 M5 differential. The 1450 kg (3196 lb) roadster rides on Bilstein B16 PSS10 coilovers, Brembo six-piston calipers with 380×34 rotors in front, and E60 M6 brakes in back.