How do you know if the cat is clogged ( insert dumb feline joke here). My 82 has lost power going up hills, I have replaced the fuel filter and pump, I need to do the ATF thing, but will use MMO instead. I'm just wondering if it is the cat. By the way it's an automatic with 63000 miles

 

well one thing that i notice when my friend rex had a clogged cat was that sounded less louder every day, hard to start and power loss. you better check it

 

jack the car up
tap the cat and if your hear little things shake around
then its bad

 

A clogged cat will inhibit rpm above a certain point. This "top" rpm will be the same in any gear because it is looking at exhaust flow, which is greater as rpms increase.

 

just take the cat off, rotary engines do sooo much better the easier they breath..if that doesn't fix it, then your rotars may be losing compression...

 

just replace with a high flow cat... don't t take it all off...