Incorrect. Offsets are not related to anything but voltage and are an ADDITION to your calculated pulsewidth, which is completely dependent on what OSID you are running... as you said some have flat the others are not.. But its more related to what bin file you are running, as NA cars typically have flat IFR vs MAP tables, while others did not... Most all supercharged cars are going to have linear IFR vs MAP, My 97 has a sloped linear IFR/Map Table.Stock offsets only make sense if your fuel pressure doesn't change 1:1 with the MAP. Even then, theyre only valid for stock injectors.