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Exhaust Backpressure Sensor by Walker Products®. Exhaust Gas Differential Pressure Sensors (DPS) are precision made for outstanding performance and manufactured to meet or exceed all original equipment specifications and test requirements. Walker Products, an ISO 9001-2008 / TS16949 certified company, specializes in the manufacturing and distribution of Fuel System Components and Automotive Engine Management products. Walker is committed to meeting or exceeding OEM or equivalent standards and specifications. This effort is backed by Walker's own manufacturing, product management and engineering expertise. Walker Premium Oxygen Sensors are 100% OEM Quality.