My actual peak horsepower and torque were 258.3 and 295.9 respectively at the rear wheels which translates to (accounting for transmission loss) 304 (258.3/.85)hp and 348 (295.9/.85) ft lbs of torque at the fly wheel.  To get a sense of how much of a horsepower and torque improvement gain I received from the modifications, you can adjust the BMW published numbers down by 15% to account for the HP loss through manual transmission and get 246.5 (290*.85) and 275.4 (324*.85).