17 There are two EFI versions and a carburetor setup for the Edelbrock/Musi 555ci bullet. Here is the most popular version—EFI induction using a carburetor-style manifold. This setup makes 697 hp and the Edelbrock EFI system is pre-programmed so the customer doesn’t have to touch anything. The Edelbrock Pro-Flow XT EFI manifold makes the most power and Musi says that setup is good for 723 hp and 652 lb-ft of torque. The Pro-Flow XT manifold is unique looking with a forward-facing throttle body that flows 1,100 cfm.