The S55 will be very overbuilt. It was designed from the ground up to be turbocharged and should not be compared to the S65 which has been proven to be a weak motor relatively speaking. The E46 M3 engine was stronger than the S65 even. The N54 already supports 700+ whp without issue on the stock components and I can assure you that the internals of the S55 are stronger.
Quote:
Originally Posted by BMW M3 CRT
Who would choose an F8x M3/M4 with an S65 (~ 440PS / 435Nm) over an F8x M3/M4 with the standart S55 (431PS / 550Nm) if this engine swap was possible by BMW Individual for ~ 7.500 - 10.000€ (including the M-DCT of the E9x M3!).
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