yup these are new to me too, mine is an M51D25 OL, post 96 is M51D25TU OL which I guess must be when they changed, which was when the E39 started production.
this must be the later one, which wouldn't fit on my manifold as its a reverse of my turbo totally.
this must be the later one, which wouldn't fit on my manifold as its a reverse of my turbo totally.