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      07-08-2011, 01:15 PM   #11
persian54
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Drives: SL550. Prev: E93 M3/335i/Z435i
Join Date: Jun 2009
Location: The Valley, SoCal

iTrader: (292)

I have a slight shimmy/vibration over 81mph on mine...I had it road force balanced using a Hunter GSP 9700, twice!

I'm thinking it may be the tires cause they are pretty beat up from track use..but it's still a PITA.

Wonder what I can do??