Are you going to get a unit that will occupy the same location as the diverter valve did? Or are you going to use a true vent to atmosphere BOV? If you get a BOV, all you'll need is to get a vacuum hose from the pressure side to operate the BOV and a diverter valve blank off plate. IIRC, you can use the location of the sound tube to install the BOV. No tune change will be needed for just a BOV..