The R&D Ultra 250 Billet Supercharger Wheel Hub Kit was designed and developed while testing the R&D Supercharger 1 to 1 Booster Wheel Kit. The R&D Billet Supercharger Hub Kit will replace the O.E.M.’s vulnerable part with a redesigned and beefed up precision CNC Machined 6061 billet aluminum part that is much stronger than stock. The new R&D design also offers pulley wheel alignment adjustments with a CNC machined Shim Kit that allows for precision serpentine belt cog alignment. The R&D kit comes complete with a special tool that will indicate the perfect alignment of the crank drive and compressor pulleys. At 8,000 RPM, horsepower and belt life can be greatly sacrificed through misaligned pulleys! The R&D Kit offers superior strength, precision pulley alignment, and extended serpentine belt life. This all adds up to a powerful gain.