Mass Air Meter by BBK®. Gain up to 15 rear wheel horsepower in minutes just by bolting on a BBK High-Flow Mass Air Meter. They come with new electronically calibrated mass air sensor modules to maintain an accurate air/fuel ratio, and they’re available calibrated for the factory air box or cold air intake kit. These meters are ideal for upgrading performance or for the enthusiast retrofitting an EFI motor into an early muscle car or street rod.