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      05-21-2012, 03:33 PM   #68
Bowser330
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Drives: F30 335i M-Sport
Join Date: Jan 2011
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+1 Basically all the things done to the S54 (E46 M3) vs. the M54 (E46 330i)...

There are countless Tune + Bolt-on N54's running 383whp (450hp) for years now...however since BMW needs to separate the "M" from the "non-M" and build the car for longevity...I would expect to see...

(1) Additional displacement vs existing N54/5...3.6L maybe?
(2) Slightly larger turbos for more top-end pull, current turbos run out of juice well before 6000rpm.

With 3.6L & larger turbos tuners should be able to bump it up to 550hp pretty easily...