The Nissan Path

So, I'm new here, and just picked up a 99 pathy SE. Cat is rather shot. Was curious as to if I could replace cat with a high flow muffler. I live in SC, so no inspections. Thanks.

There are two cats, one on each header.

I voice typed this. Found both laying under it after i posted.

Having two cats makes the car ideal for a custom dual exhaust setup. Flowmaster, Borla and, several others make high flow stainless two in two out mufflers. I did my 98's exhaust all stainless a few weeks ago. I'll post some pictures if I can figure out how.

Federal emission vehicles came with two converters that bolt directly to the end of the cast-iron exhaust manifold. California emission vehicles came with four converters: two similar to the Federal emission vehicles and then another two that are built into the front pipe assemblies.
If you have the CA emissions style and wanted to replace the rear converters, you could just swap them with a front pipe for a Federal emissions-type Pathfinder. Walker #'s 53482 and 53483 would work for that. It wouldn't create any CEL issues because the rear converters are not monitored by the ECM. While it would likely pass SC emissions, technically, it is Federally illegal to remove or tamper with any factory-installed emissions device on a motor vehicle. Whether they would catch you and prosecute you are highly unlikely, though, as they probably have bigger fish to fry!
To replace the upstream converters on a CA emissions vehicle...or replace the two converters on a Federal emission vehicle, is a bit more difficult due to the design of the mounting between the exhaust manifold and the converter. The only way I could see doing it would be to replace the manifold and converter with headers, which would require using CEL eliminators to keep the ECM from triggers catalyst efficiency codes and turning on the CEL light.

Thank you for the info.