Originally Posted by fireline43
Well look at it this way. BMW only used the n54 for a couple years then changed it to the n55. They don't seem to have much confidence in the engine either.
If BMW didn't have much confidence in it they wouldn't of put it in the 1M and 335is..... BMW switched b/c the n55 is less expensive and is able to produce the effectively the same power more efficiently. it's a cost cutting measure, along with efficiency.