I bought one of these for my 82 w123. It is basically plug and play, and it includes a new turbo mine came with the KKK turbo which really makes the car scream.

__________________
2005 SL65
1999 E300
1995 E300
1994 SL320
1988 560SL
1987 300TD
1982 300D
1955 300SL