FSYS lowers FY10 rev guidance to $420-430 mln vs $440.61 mln Thomson Reuters consensus, down from prior guidance of $425-450 mln. Co reiterates expectation for gross margin to be approximately 29%-31% and operating margin to be approximately 14%-16%, unchanged from its last update in the third quarter earnings release. Co says fourth quarter 2010 revenue to reflects softer European automotive purchases consistent with near-term economic trends in the region partially offset by continued strength in the IMPCO business.