Banks' revolutionary design produces stronger braking power than other exhaust brakes. The large-bore housing, streamlined to increase airflow and diffuse exhaust, adds to engine power when Banks Brake is inactive. Banks engineered in a timed valve closure rate to prevent backpressure spikes common to other exhaust brakes and provide smooth operation. Every unit is factory tested and never requires calibration. Note: SmartLock required on automatic transmissions. Key Features: Pays for itself in reduced brake wear and brake maintenance Cut downhill speed up to 49% without using wheel brakes! Computerized brake controller Saves brake wear-and-tear Controls Downhill Speed Safe, reliable operation Value-Priced Braking! No maintenance SmartLock required for auto trans (#55262) US Patent #6,152,853 A 50 State Compliant CARB E.O. D-161-140