After I purchased my 8, 06 Mt 105000 miles, I tuned it up and eventually discovered the cat was clogged. From the manifold side the honeycomb was perfectly intact but when I took a probe into the o2 hole everything was a crumbled mess. So I got a new cat and a few months later the whole cat is bright red after a hard run. I tested ignition, cleaned ess, cleaned spark plugs(which had just a bit of carbon on em) new maf yet high rpm loss is still there. Ssv moves freely and works fine cause I did the shut down test. I also remember after I got the new cat it improved power just a bit. I've ruled out compression since it starts hot Everytime and the motor pulled hard as f*** when it had full power. It sounds like it can't breathe in high rpms and the rpms climb very slow.
So could it be possible I have pieces of the old cat in the catback? Help a fellow rotary brother out?
Thanks

 

Possible.......also the CAT could be fried again.....did you get an aftermarket one or OEM?

I melted a high flow CAT in an afternoon at the track once.....decided that wasn't a very cost effective solution to the CEL from no CAT 😎

 

Aftermarket Walker cat, yeah I'm gonna drop it and take a look, and if so I'm gonna gut the hell out of it lol it's just driving me nuts I even went to a "rotary" specialist who asked me how did I get my air solenoid out.. so much for a specialist.

 

I also found the remains of an old cat inside my exhaust. I'd been wondering where Fluffy had gone to.

 

Fiery.. I mean Fluffy, is in a better place now.

 

update

Took down my cat, shook it and it rattled a little bit. I also put a light on one end and could not see it from the other. Looks like it's clogged. Didn't see any blockage in the back pipe. I will be gutting it