i think we're both trying to do the same thing, seeing as youve asked %90 of the questions i have:rofl:. wether its clogged or not the general consensus is that a new high flow cat is going to be much better than the old double cat system. unless like me you just are curious if your current cat is plugged and holding your stock milage back. im just assuming mine is. im gonna get a cat off ebay for like $40. i got a jar of change in my room with a counter thingy at the top thats at like $145. im just gonna cash 40 from there into coinstar then deposit that in the bank. then ill just use a check or credit card to buy the cat. that way its like i didnt take money out of my account, just utilized unused change.:toothless ima do the same thing when i get the flowmaster collector.:thumbupOr no change in engine performance. I did that. No black soot or change in engine performance.
in other words an new cat is cheaper.:toothlessInfrared 5-gas exhaust analyzer, or a comparable exhaust gas analyzing apparatus. There is no other reliable way to know, with absolute certainty, whether a catalyst is functioning correctly. I recommend using a vacuum gauge test or temperature (thermocouple) test, but a visual inspection is #2 only to the infrared analyzer.