I'm running this OS in my LS6 powered '82 Corvette and the scanner says that Catalyst monitor isn't supported. This caused me some trouble when I went in for my emissions here in Colorado, I know those vans had Catalytic Converters so why no monitor? Does anyone know? I've been through all the diagnostic codes and there isn't anything related that's turned off. I'd use the 06 Van OS but it doesn't start well with that OS, or run as well either.