The factory diverter valve on your XP Turbo is made from plastic and can warp or crack from high temperature causing boost leaks and loss of power. This valve can be installed as a factory style recirculating diverter valve or a like a standard blow off valve producing that "blow off" sound every one loves. Simply plug off the factory diverter hose and vent the blow off valve to atmosphere. The Deviant Blow off valve is a great upgrade to anyone who has the boost turned up past 18PSI. This valve reacts very quickly limiting harmful compressor surge.