HPF opens up AEM EMS E46 M3 turbo tuning options by unlocking the piggyback - Response to pressure from Pro-EFI?
HPF has unlocked its AEM engine management system for all customers. Well, they have unlocked it for an extra $1000. That 1k buys you the ability to tune for different hardware than what HPF provides, larger/smaller turbos, as well as E85. So, they are mimicking what the Pro-EFI does except with a monetary penalty. Would this have come about if the Pro-EFI was not stealing a bit of thunder? We seriously doubt it. With the $1k it costs to get this feature from HPF, it may simply be better to go Pro-EFI to begin with. Still, this is a nice option and one that should have been available a long time ago although we understand how HPF would be apprehensive about novices blowing up their motors.