So I was wondering if anyone could explain exactly what is happening in the motor when the 12v sound tune is used from DRD. From what I have been able to find from other places, it has to do with the pilot injection, but have been unable to find anything else on it. Does it help with fuel mileage at all? (have read both ways this side of sunday for and against it helping or not helping), Does it have negative affect on the motor using it daily and while driving? Thanks for the imput.