DPL TOOLS Exhaust System Diagnostic Tool Exhaust Back Pressure Tester by DPL TOOLS at Daily News Detroit. MPN: DPL. Hurry! Limited time offer. Offer valid only while supplies last. Exhaust System Diagnostic Tool Exhaust Back Pressure TesterAdaptor fits into oxygen sensor hole enabling back pressure of mufflers and catalytic converters. Gauge adapter threads intooxygen sensor ports (both 12mm and 18mm).. Test at idle and at2500 rpm's. Pressure should be below 1.25psi at idle and below 3psiat 2500rpms.. Higher readings indicate a restriction which shouldbe corrected.
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