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I have both a 2008 335i N54 and a 2001 e53 M54.
I suggest staying with the M54. The N54 is a pretty hot motor and needs a lighter vehicle to perform well. We've done several engine swaps at our house over the years and by far the happiest ones are where you don't have to go deep into the engineering and ECU to get a running car. I don't think you will get a lot of bang for your buck divided by the hassle factor to the square of the number of looks you get from the missus x one over the garage space lost when you hit the wall. Now being a car guy, you may do it anyway. Just keep falling maple trees away from your N54 powered vehicle....
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2001 x5 3.0 (sold with broken motor), 1990 e30 M3, 1991 318is, 2002 325i, 2008 335i Dinan stage 3 6 speed,
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