ehhhhhhhh i doubt it.
the m54 (to me) feels like a stronger engine. you can turbo or supercharge it for much less and still get big numbers like you would adding a tune to an N54/55. Additionally the 340whp in a ZHP would blow away a 340whp N54/55 because of the gearing. I can keep up with a stock N54/55 up to 60-80mph pretty easily now with only around 210whp/wtq (it'd pull away quickly after that because of power difference).
Now swapping it for an S54, S62, S65 or S85... different story.
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