careldo Posted January 30, 2004 Report Share Posted January 30, 2004 Hi guys, my cat on my 92 eldo 4.9 i believe still has the original cat and was wondering if i should just replace it. I hate to replace it without just cause so i am trying to figure out how to measure back pressure. In the manual there is some mention of installing some tool in the exhaust and if the reading is above 1 PSI it would indicate an exhaust restrication. Has anyone on this board done this before? Where does one install a gauge? careldo Link to comment Share on other sites More sharing options...
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