Originally Posted by shift@red
From the small bit of research I did on baseline dynos between a 335i and 335is, it looks like the iS motors only put down ~10 more rwhp than a regular motor.
Only 10 more peak
rwhp. But if you look at the hp and torque curve, the is motor is putting down 25+ more hp throughout broad areas of the entire rev range and over 60 ft-lb more torque. The 1M is rated at 15 more hp than the 335is so its N54 motor is likely putting out even more power than the standard 135i and 335i N54 motor.