325i/325is M50TUB25 The M50B25 was updated with variable valve timing (called VANOS by BMW) on the intake camshaft in 1992. Peak torque became available 500 rpm lower, at 4200 rpm. [2] Applications: 1992-1995 E36 325i/325is 1992-1996 E34 525i/525ix S50 The S50 is higher performance version of the M50 which was used