My issue is I don't want to live the mercy of having my tune rely on some guy on the other end of an email. How is he supposed to be able to properly tune a unique combo without real time feedback? I'm just not a fan of this one size fits all type tuning. I've played with a program before for retuning stock type ecus. It's doable but very overcomplicated compared to an aftermarket system that's designed for this kind of thing. If the vehicle the OP is building the magnum for is not a 90's OBD-2 truck, I wouldn't bother with the stock electronics.