I'd like to know more about where the power comes from on an aftermarket ecu. I'm not trying to be rude, but I'd like a little education about where this extra power is coming from. Someone else stated the proEFI will enable power to be freed up. I realize that better knock control as well as more precise fuel delivery/timing will get you more power in that you may feel safer pushing the car, but I don't see how a stock ecu running appropriate timing for the fuel used will make less power than a standalone ecu at the same boost levels on the same motor. It may be a comfort thing, but as far as I have ever been taught, hp is determined by mass air flow through the motor, AFR, and ignition timing, and I dont see how these factors are different on any motor regardless of engine management. Heck, even a carbureator tuned right should make the same power on any given car at the same boost, timing, and AFR on any given IC engine. Guru's, please enlighten me...TIA. And I can't help but think that street drivabilty has to be hindered at least a little bit with SD setup vs MAF unless you are doing your own tuning, constantly. I'd like to be corrected on this too. I want to make the jump to FAST basically, but I don't see where the power is going to be to justify the expense, at least at my power level and I drive 10k miles per year through varuous climates and I want to keep my MAF for those reasons.