Spirra is Proto Motors' first attempt at creating a supercar."Consumer Reports"The original design of the Spirra featured a 4.6 DOHC V8 32V engine with a power output of 320 hp (239 kW)."ProtoMotors". This engine was a modified Hyundai engine.
The engine delivers over 312 lb·ft (423 N·m) of torque to the ground. The Spirra has a claimed 0-62 mph time under 4.0 seconds with an expected top speed of 200 mph (320 km/h).