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Professional ProductsThrottle-Body EFI SystemProfessional Products [www.professional-products.com; (323) 779-2020] introduces the Powerjection I throttle-body EFI system. It allows people to enjoy the benefits of electronic fuel injection and retain the conventional layout in the engine compartment. The system uses a throttle body that bolts in place of the carburetor on the intake manifold and uses a returnless fuel system for easy fuel-line plumbing. The throttle body is available in either die-cast or billet and conceals four high-pressure fuel injectors. The system includes the engine control processor and costs $1,800.