lol - That was some hard persuasion from my side.... Convincing him to get OEM spec Rad Cap, T-Stat Valve.
IMO installing CNG over 7th Gen Honda Automatic is the death of it.
Sadly people don't listen - They proudly remove the T-Stat, Put low pressure cap to compensate for the weak / rusted cooling system, add ZIC transmission oil & Warco PS oil. If stopped/warned they get offended and feel that warning them is somehow challenging their super intelligence and long royal history of buying/maintaining expensive cars.