The BMW Power Performance Kit(PPK) has to be the biggest swindle ploy on the planet and they have us falling for it.
We buy our cars factory stock and they perform like rockets, then we get a stream of mandatory software updates that essentially de-tune the car to unacceptable levels...that has not gone without complaints on this site and others.
Then they have the balls to offer a PPk to customers unhappy with current performance levels, really, WTF!! And they are relatively expensive when factoring in parts & labor.
They got balls is all I can say.