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The OEMTOOLS Exhaust Back Pressure Tester/Gauge allows user to test exhaust back pressure through oxygen sensor. The oxygen sensor adapter is M12 and M18 thread, and features a 2-1/2" easy-to-read gauge. The gauge has 2 multi-colored bands to test idle and 2,500 RPM.Warning: This product can expose you to chemicals which are known to the State of California to cause cancer and birth defects or other reproductive harm.
