Walker CalCat (2004 Jeep Grand Cherokee 4.0 I6 engine):
https://amzn.to/2Hw9f8x

my 2004 Jeep Grand Cherokee WJ failed smog because the catalytic converter was not California Compliant (Which I didn't know when I bought it). TODAY, I installed a Walker CalCat that I bought on Amazon for just under $400 and it passed smog after this. Here's how to do it (in the video)! This was the only Cat under $700 that was CA compliant that I could find.

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