Originally Posted by Ian///M
Yes, 1M had CDV. Some swear by this mod. I did it on both my cars and didn't notice much. I think it depends on your clutch technique. The clutch take/release points feel more predictable, but don't expect a night and day change.
1M has the N55 135i transmission, not the 135i N54's.
For $25, easy mod. If anything it will make your clutch last longer. It puts less strain on the clutch and more on the rest of the driveline from what I have read, but I could be wrong.
so a 1m is the basterd child of the n54 and n55
Sorry couldn't help that one
BTW Joe that was a stir