I'm kind of a catalytic converter geek. I have had various set of HF cats which i'll chronicle below.
- Random Cats - I can't remember who sold these but they were "ok". I didn't burn them out with a slightly richer running CTSC
- Angus Cats - I got these when I transitioned to a 00+ header to a 91-94 muffler. One of the cat elements is now kind of loose in there but still works fine.
- No Name brand - I think these were one of the old Dali cats with a generic core. Didn't keep for very long. Was stinky stink...compared to the previous 2.
- Magnaflow bullet cats - back when they still sold these in CA. They worked fine but this was with my valved exhaust where at WOT and/or VTEC the cats are bypassed
* The other cats sold (Pride, etc) just seem like the standard widely circulated China cat. I have no personal exp with Pride cats but my experience tells me i'd render them useless after 5k-10k miles.
None of the above passes CA smog at least in my car with various ECU tunes including stock.
Currently in my garage...
- SOS cats (not the high hp one). These seem to work pretty well. I have not smog tested it as I don't have a smog tune to accompany it yet but they seem delicate. I would not recommend these for an NSX unless it's on the OEM ECU tune which is rather lean. I'd be very curious which element their using for their high HP ones. Chris normally pics good quality stuff. My guess is Kook's racing cats is the manufacturer.
My latest experiment is below. HJS. In all my years of research these seem to be the cat's meow in terms of motorsports grade performance cats that actually works as proper converters. These have highest precious metals content on a per square inch basis (internally). It was a huge PITA to get these shipped to CA. These are what Porsche Motorsport uses and are German made. They were $$$ and i'm excited to get them fabricated into my setup.
I know this is above and beyond what you asked but cats are kind of my weird guilty passion.
