There may be people who can help here, like maby Swifster but, if your takling about your Neon , most of us arn't farmiliar with the 4cyl stuff. I'd think the computer would ajust the fuel pressure/ mixture itself, just as it does when going from a higher to a lower altitude or vise versa, forced induction would be calculated as a lower altitude as places at lower altitudes have higher air preassure, it might flash a check engine code saying the preassure is higher than the tolorance the computer allows but it should ajust itself.