Small correction, it's a 2.5....and it was not converted. Its 91 season car, originally in West livery (hence the white base color) now in debis livery due to the tobacco advertising ban (it was never a debis car) . Car was taken out of the Mercedes-Benz collection and reconditioned for special events driven by former dtm drivers and celebrities during touring car revivals such as "tourenwagenlegenden" and fos.
I like the earlier debis livery better, see second pic.