My catalytic converter took forever to heat up correctly for my California smog check so the smog technician said it probably is time to replace the catalytic converter after 160,000 miles.

I have the CA spec Cattman Y Pipe that I ordered probably in the early 2000's. If the catalytic converter took forever to heat up enough, is it likely that my precat is clogged, right?

So is the precat a part of my Cattman Y pipe to where I can't change it? If I can change it, should I change both cats or just the front one?

 

Anyone have an idea? I have to change it within a month

 

California emissions standard with 160k on the main cat? Replace it. That's probably about the lifespan you can expect to achieve under CA regulated efficiency. I wouldn't worry about the precats unless they fail inspection.