You chose a carburetor for a reason. The familiar hardware, traditional appearance, and performance all belong in the experience of owning your classic car or truck. But keeping those benefits used to mean giving up the convenience of modern electronic fuel control. Not any more.

The new CFI Enforcer Series Classic brings both together. This hybrid carburetor and electronic fuel-control system places an injector plate beneath your existing carburetor, adding supplemental fuel when needed. Your carburetor continues handling airflow and baseline fueling, while an electronic control unit helps fill the gaps. You keep the combination you enjoy and add precision where it makes a difference.

Easy Installation Without a Complete Fuel-System Overhaul

The Enforcer Classic installs beneath the carburetor much like a spacer plate. For many builders, the most involved installation step will be welding an O₂ sensor bung into the exhaust. The remaining work includes installing smaller carburetor jets, mounting the compact ECU, connecting the injector’s fuel supply, and completing the necessary sensor and wiring connections.

Those smaller jets reduce baseline fuel delivery, giving the electronic system room to supply additional fuel as needed. The distinction is simple: CFI adds fuel; it cannot remove fuel already supplied by the carburetor. A slightly leaner baseline lets the carburetor and supplemental injection work together.

Operating at 3–10 psi, the system allows compatible existing fuel pumps and low-pressure plumbing to remain in service. No fuel-tank modifications, high-pressure conversion, or return line are required. An electric fuel pump is necessary for automatic cold starts, while ignition-timing control is optional—you can use the system for supplemental fueling alone.

The Difference Is in the Drive

A wideband oxygen sensor monitors the air-fuel ratio, giving the ECU feedback to adjust supplemental fueling toward the selected target. During warm-up, changing weather, and throttle transitions, that electronic assistance helps address lean areas that a fixed carburetor calibration cannot continuously correct.

Even a combination that already drives well can benefit. Supplemental fueling can help smooth transitions and sharpen throttle response, working quietly in the background while the carburetor continues doing its job. For enthusiasts who want more control, the system also supports electronic ignition-timing adjustment.

CFI lists easier starting, smoother warm-up, improved idle quality, and more consistent part-throttle response among the benefits, along with reduced exhaust odor and improved fuel economy. The appeal is straightforward: more modern driving convenience, with the carburetor you want to keep.