2.5L 24v - M96 The 2.5L 24v - M96 category carries Porsche's first M96, the Boxster 986 (1996-1999, 204bhp EU / 201bhp US), engine code M96.20, and the switch from air to water cooling. A single active reference: the WOSSNER forged piston kit 169805, 85.5mm bore, 11:1 CR, 22mm gudgeon pin, 35.3mm pin height. Within this family's M96/M97 group, this page holds the smallest capacity, the only 2.5L, while the other pages carry the 2.7L.