THESE SPECIALTY OXYGEN SENSORS ARE MADE FROM PREMIUM MATERIALS AND ARE USED IN HIGH PERFORMANCE APPLICATIONS. BOOSTPOWER OFFERS SINGLE-4 WIRE AND SEVERAL GRADES OF THESE SENSORS INCLUDING LAB GRADE PROFESSIONAL SENSORS FOR MOTORSPORTS. STAINLESS STEEL BUNG KITS AVAILABLE FOR SIMPLE WELD IN INSTALLATIONS. STANDARD OEM SENSORS ARE AVAILABLE UPON REQUEST. PLEASE CALL FOR MORE INFO. 805-376-6077 M-F 9-4 PST.