Hello, I have an HP tuner standard package I just picked up.

So I have an LS 24X engine that I cam putting in a swap vehicle. I have a junkyard ECU(0411) , not sure origin, that I wish to "write entire" a car tune on, something like an '02 Camaro tune that I get from the repository. How do I go about this, Don't care about the tune that's on the PCM right now, And how many credits will this cost me ? Thx.