I had one and same year. About 85K I had to do the mafs. Then I put in a UUC clutch,ssk &lfw from frying the oem sac (Same clutch as a 530-540) (kind of a weak spot) Then the head gaskets kept failing.... But the main problem with that car is the engine and whats referred to the carbon scourge.. You can find many posts on the M5 Board.
All thogether an am///aizing car.. 18k Enjoy the **** out of the car and the pootang that will come along for the ride!!