The Ballenger Motorsports AFR500 Air Fuel Ratio Monitor has proven very successful. In a world where cost-cutting reigns supreme, we’ve kept the calibration quality air fuel ratio meter made by ECM going strong. In its original form, it was sold as the NGK Powerdex AFX, it was replaced in the NGK/NTK product line due to high cost and low margins despite its popularity. The first AFR500 system debuted in 2014, and the first significant upgrade version 2 debuted in 2016. Sometimes quality comes at a price, and we plan to keep offering this high quality product to consumers, dedicated tuners, and industry professionals. THIS IS THE NON-CAN VERSION, ANALOG OUTPUT ONLY.