Indeed, they just tell you that you’re killing trees because of your cat efficiency.
John, I love you (no homo) and you know your shit, but don’t take me for a run of the mill advance parts guy, I’ve done my fair share of troubleshooting over the years and going above and beyond to get to the bottom of wierd issues.
I don’t know it all, and I won’t claim that by any means but I know enough to have a good discussion and or argument.