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My 5.3 has one on each bank and one more after the wye. I gutted that third one cause the 3rd cat has no sensors. Not sure if the 4.3 is the same, but can confirm the 5.3 has 3 cats. Pretty evident if you crawl under and take a peak.
 

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Discussion Starter · #3 ·
I think they might as there are two obvious cats off of the headers and something that looks like one where they meet just before the tailpipe connection. I'll try and get some pix.
 
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