I always had two tunes because my Greddy Profec-B SpecII had a high and low boost setting. My low was set for daily driving at about 16psi with the cutout closed. High was set for racing at about 23psi with the cutout open. That removed any worry about the negative effects of it being open, but I would open it for certain situations on the road (like pulling up next to a new NSX to make him cry :rick: :shhh: )