Cat AFTER muffler?

[grampadirt]

My burb has the cat after the muffler as well and a single wire o2 sensor.Also,the cat has to have a stamp or embossed note on it that it complies with Ca. emissions so no universal cats here.

 

[whiteboyslo]

They make universal CARB-compliant cats. They're about $100 from Flowmaster, Magnaflow, Walker, etc.

Mike

 

[Schurkey]

I've noticed that little sh!tbox four-poppers have the catalytic converter integral with the exhaust manifold.

I'm suspecting that moving the cat downstream behind the muffler may be to protect it from OVER-heating due to a bigass engine that (potentially) would be running with it's tongue hanging out.

You guys want weird? 1975 Ford LTD 400 2V. There's a catalyst near the right side exhaust manifold. The Y-pipe from the left side joins the right side AFTER the catalyst. Yes, you heard that right: One cylinder bank exhausts through the catalyst, the other side doesn't.