Ceramic or Metal Matrix Cats
The "chore-boy" type packed inserts for Jet-Hot headers
blew out / burned out on a lot of people. I do not know if
the more modern ones have a "brick" or the wireball type.
Metal substrate is going to be less resistant to very high
exhaust gas temps, than the zirconia bricks used in OE
cats. Boosted guys or anyone running wide open for a long
time, will probably put a hurt on a metal-substrate cat.
If you don't keep COT enabled, anyhow. And nobody who
is chasing sustained high output power wants that left on,
not at factory settings anyhow.






