I have an 08 Outlook XR with 4800 miles. Took in for 1st service and the dealer found a problem with the cam timing. After 12 days in shop with a left cylinder head and twin camshaft replacement, the vehicle now has a "harmonic" roar at 40 and 60 mph. I've had it in the shop on 5 separate occasions for the roar. The service dept says they can't hear it or duplicate it. I notified Saturn Customer Satisfaction in Tn. and they literally told me it's my imagination. The dealer says there were 263 Outlooks throughout the U.S. with the defective heads. Has anyone else had the problem?