In short, it is coolant pump. It helps keep everything (Intercooler/Supercharger) from overheating. When the pump fails the the car stills drives, although not very quickly, the supercharger acts more like a hindrance than a helper. It is not as bad as you might be thinking; mine died @ 30,000 miles and it cost less than $400 (parts and labor) to replace. I wouldn't imagine you'd have much to worry about with only 6600 mi. It is a fantastic car and you won't see many, if any, more of them on the road so enjoy the attention.
-Robert