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He pretty well summed that up, take it to someone who has a backpressure gauge and they will test it. What he didn't tell you is that the cats don't clog themselves, a clogged cat is usually a symptom of another underlying issue, something like excessive oil consumption, antifreeze consumption, rich condition, misfires, etc. If you replace the cat without fixing the cause of the problem, the same thing will eventually happen again.
 

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Cat Pressure

He pretty well summed that up, take it to someone who has a backpressure gauge and they will test it. What he didn't tell you is that the cats don't clog themselves, a clogged cat is usually a symptom of another underlying issue, something like excessive oil consumption, antifreeze consumption, rich condition, misfires, etc. If you replace the cat without fixing the cause of the problem, the same thing will eventually happen again.
So why not measure the pressure at the DPFE hose connection? Pull the hose from the high side, and hose a gage onto that.

-chart-
 
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