My check engine light is on for my catalytic converter, and i want to know if this is a good thing to get to rid the CEL. Should i just get the Magnaflow cat from AutoZone? Will either of these fix the CEL? Also what could have caused the cat to go bad? Thank you!

 

If you do not use a reflashing device to block the P0420 CEL, then in order to prevent it from appearing you need a cat. That cat can be in any pipe you want, but the cat elements must be there. Not all cat elements are created equal, and MOST cat elements can not handle the heat of a rotary, including the autozone ones. You will spent however many dollars for a few hundred to a few thousand miles before the cat fails again. Feel free to repeat as much as your bank account can handle, though at some point it will be cheaper to just get an OEM cat.

A "BHR midpipe" may or may not solve the problem, depending on if you get it with or without the cat installed.


Cats fail because of heat and fuel. Both of which the rotary shovels through the exhaust system in copious quanties. ANY cat will eventually fail, just the OEM one lasts the longest before succumbing. If you have any misfires or anything else that makes the engine not run perfectly, the cat will fail much faster. A single failed coil can kill a cat in as few as a few dozen miles, for example.