Supposedly the Kooks green cats are made a lot better than most aftermarket cats. Per Kooks, they will handle a high horsepower, high boost supercharged car but I don’t know what the limits really are. I put them on my car recently but I’m only pushing 600rwhp and haven’t had them on long. There is a good YouTube video that can be found about the green cats and how they are manufactured relative to most aftermarket units.
This is probably the Green Cat video you mention. Very informative. Of note, they said it would take 2700 degrees to melt those cats. And, they are double locked to hold the substrate in place, should it come loose.
The only "fuzzy" I see . . . they say verbally it is meant to handle upwards of 1000RWHP. However, behind them, it says "up to 850 HP." Perhaps that is "per bank" and likely crank HP. But, there is some "fast and loose" going on with the numbers.
Mine and my buddies Kooks green cats burned up in about 10 minutes of running at VIR in ZL1’s. These CANNOT be used for HPDE’s even short sessions. Completely hollow now. Had to cut the pipes to find the guts. Very disappointed.
If you look, I think you'll find that Kooks and Vibrant are using some of the cats made by GSPORT.
About Us - G-Sport - High Performance Aftermarket Catalytic Converter
Scroll down their facebook page and you'll see shots of them being manufactured.
GSport
Think they'll live when pushed, say, at VIR? I I honestly doubt it. One guy that used them had this to say...
I'm no big fan of Alejandro Flores but I agree with what he says here about failing cats.
"Furnace brazed" or otherwise, if you actually put this type of cat to the test, I don't think many here would be happy with the results. Short bursts on the street? A dyno test here or there? You may get by. Hit a roadcourse with the kind of power talked about here in conjunction with these aftermarket cats...hopefully you don't lose an engine.