LSD is a must have upgrade for these cars. Street or track.
PM Mike@VAC. VAC will do a pumpkin swap w/ deposit.
http://www.e90post.com/forums/showthread.php?t=670174
I wouldn't go anywhere else but VAC ...
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2011 BMW E92 335i, 6MT, Le Mans blue - Quaife LSD, JRZ RS Pro, JRZ camber plates, Eibach ERS, full M3 susp, custom toe arms, Powergrid end-links, SS brake lines, brake ducting, Michelin PSS, UUC SSK, ETS FMIC, ER CP, Perf. Exhaust, VAC RSIK, Sparcos; work by VAC Motorsports in Philadelphia