We've got one of these babies on VMP's SuperRaptor! This 72mm pulley for our VMP TVS 2.3L supercharger as well as Roush for Raptor! Delivers 10psi of boost. Ready? GO! 91 and 93 compatible. Fuel pump booster recommended Recommended to use with the stock belt and a VMP 90mm idler. Gates K061251 belt will work in leu of Roush belt but is tighter, will not work with stock Roush 75mm pulleys.