I had just installed a FlowMasters Super 44 muffler on my Excursion but after that there was no difference in the sound. My first thought was a clogged catalytic converter so I looked at high flow cats and there were plenty to choose from. I chose this AutoSaver88 2.5 cat purely based on reviews and the local store replaced my old one with it. In fact, my old OEM catalytic converter was clogged! Cut the old one off and weld this in place and WOW! It really opened up the flow and now my exhaust sounds fantastic. The check engine light is (still) off when I get home. I'll update my review if I come across anything different than what I've already said, but so far I'm very happy with this purchase. I was skeptical about this due to the price and only time will tell, but the fact that the Check Engine light didn't come on right away gives me confidence. If I end up hooking up a CEL to a downstream O2 sensor I will try to add a CO2 washer. But so far so good!
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