The Bosch LSU4 Oxygen Sensor is widely used in the FAST product line. Finding its way into the FAST EZ-EFI Fuel, EZ-EFI Fuel + Igniton as well as the XFI Sportsman and even the FAST Air/Fuel Meters, the LSU4 is accurate, durable and essential to the operation of a number of FAST products. Catalog User 1
