Hi there,
I had my diesel vehicle inspected at an emission testing center this morning, while waiting for my turn I saw a '97 Pajero being carbon cleaned. After the process, I talked to the owner of the Pajero and he told me that there was no improvement at all. He even told me that the whole thing was a set-up, the testing center also does carbon cleaning kasi. I was thinking of having it done to my car if ever it failed the emission test, buti na lang it passed.