Just installed today March 27, 20192 "OD and I think it's 1-13/16" IDN. Good looking cat and O2 sensor output port is a definite bonus. In some setups the O2 sensor is near where you need to cut out the old one. Well after some time under my truck I can tell you my OEM cats didn't flow as well as these. Perform CAT demonstratively The catalytic error has been fixed and has not reappeared.
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