I find it amusing - bmw engineers pour thousands of hours into developing and fine tuning the engines, gearbox, chassis, drivetrain, management and stability systems to work in harmony with each other - to give the optimum in performance without sacrificing the longevity of any parts, and then along comes a hack (errr I mean tuner) and offers "more power" from your engine. Sure go ahead. I wouldn´t - but then again, what would I know