The BMW M5 may very well be the most understated, maybe even under appreciated M-badged BMW today. For one, the current F10 generation has been around since 2010 and the next-gen model isn’t expected to arrive until 2017, at the earliest. But the M5 doesn’t seem to mind it. The high-performance sedan just keeps moving along and despite the lack of buzz surrounding the car, tuners like Speed Buster are more than happy giving the sedan some aftermarket modifications befitting its status as an M-badged model. This particular program is no different as Speed Buster prepared a muscle-building tuning kit designed to increase the M5’s output to as much as 695 horsepower and 623 pound-feet of torque.