As you are such a supportive customer, can you get us some hard solid data, the same stuff we actually show customers to prove their cat converter is bad.
The two tests are called
Pressure differential check
Oxygen holding test
To date i have not had a single input from them or their customers, and when presented with a tech question, the answer is always “name calling or feel of car” etc etc” . My offer for dpf and exhaust stack cleaning for marine diesels still stands,
They will have to technically prove that their service works,
Dont be sad, its a classic Pakistani trait to counter tech questions with emotion.
Lol, hydrogen cleaning - lol