Why in the heck do all of these mods for this car state something to the effect of a "Core Charge"... What the hell is that? Im just a dumb ol' mustang guy..... we dont have core charges... some examples are the PCM V1.0 "Refundable Core" and a Power Log, which Im guessing is also called a "plog" it has a "Core Charge" WHAT DOES IT ALL MEAN BASIL!?!?!?!?!?