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Old 10-09-2013, 03:21 PM   #14
barf
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Join Date: Nov 2011
Location: united kingdon
Posts: 34
My Ride: m3, 325ti, 118d
Quote:
Originally Posted by serdar255 View Post
Headers+tune

Not sure but maybe no sap either


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yeah, I think it is the headers and tune.

having read up on some figures, most if not all versions of the m50 series of engines seem to be in a state of tune which is slightly less than the euro equivalent. I can only assume that this is due to strict u.s emission regulations.
saying that though, I doubt there will be any difference in performance with a bit of creative selection of final rive ratio's. bmw did this with the u.s version of e36 m3 and performance was probably on par with the euro s50/52 versions.
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