We have seen poorly made pulleys that fall off their shaft, that cause belt slip. Wraptor pulleys are tried and tested and machined to very tight tolerances, made from quality materials. This can be installed on its own, or to get even better gains combine this with our performance remap (check out our level 2 tuning package). Some supercharger snouts require the casing grinding down slightly to get the new smaller performance pulley on, please measure carefully.