Acura NSX 2017-2022 Science of Speed JB4 Tuning BoxDESCRIPTION The JB4 Tuning Box allows you to extract 40 100 horsepower gains from your NSX! By intercepting engine pressure sensors and monitoring engine parameters through the factory CAN bus the JB4 Tuning Box intelligently increases engine output while maintaining the factory ECU's fuel, ignition, and engine safety strategies. PERFORMANCE: The JB4 Tuning Box increases horsepower by 40 to over 100 horsepower depending on the type of fuel used. 91