Writer Ezra Dyer met up with Steve Dinan at the Pebble Beach Concours to take a drive in the 550xi S2. Check out his full review after the jump.Writer Ezra Dyer met up with Steve Dinan at the Pebble Beach Concours to take a drive in the 550xi S2. This AWD version of the 550i makes 508 horsepower and 584 lb-ft of torque after the the Dinan treatment and Ezra certainly seemed impressed.

Check out the full story of the Yahoo Autos experience of the Dinan Difference HERE