F22C with expanded displacement due to stroke up compared to F20C. For MUGEN, it was also the start of the development of a dedicated exhaust manifold. Aiming for further power and easy-to-handle engine characteristics, dynamo tests were repeatedly conducted to determine the optimum layout. By changing the primary length and gathering point from the F20C exhaust manifold, power and torque have been improved throughout the entire range from low speed to medium speed and top end.
