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      11-15-2012, 03:56 AM   #5
First Lieutenant

Drives: 2012 135i
Join Date: Jun 2012
Location: Sacramento

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2012 BMW 135i  [0.00]
DCT is being used without issue by plenty of people here on the forum in some fairly high hp/tq setup's.

Although I have no experience with the jb4 it appears to have the most upside and flexibility. I don't believe any tune is foolproof, but you don't hear any folks posting about how their motor blew because of the jb4.

On a side not, if you don't plan to buy new then consider the n54 motor in the 08-10 135 if big gains are what you are looking for since those motors have a bigger upside with just fbo.