Zero % risk, to me, means impossible. I am not sharing my personal view about such broad topics on an open forum, but I am not concerned about him- I think he will be okay
But I do think it's a disservice to individuals who do not do detailed research, read that post, and think that there is no risk. There is. It is against the law to tamper with emissions systems. The only solid legal writing I could find was on the details of the catalytic converter, but that is why I stopped searching and came back here- hoping you already had a source.