All 986 and 987 Boxsters use the M96, a water-cooled, horizontally opposed ("flat"), six-cylinder engine. It was Porsche's first water-cooled non-front engine. In the Boxster, it is placed mid-engine, while in the 911, rear-engine. The mid-engine layout provides smoothness throughout the rev range, a low center of gravity, near-perfect weight distribution, and neutral handling. Early engines had a small number of failures, due to cracked or slipped cylinder liners, which were resolved by a minor redesign in 2000. Other failures have been reported, most notably involving the intermediate shaft (IMS) bearing, but affecting less than 5% of all cars.
The Porsche 911