MSP 5.5" E36 Z3 ISR Dinan Supercharger 8-rib Crank Pulley

Increase your E36 Dinan supercharger belt grip and boost with an original Dinan spec upgrade.  Dinan had a rare 10psi Intercooled Z3M ISR Roadster that used a 5.5" 8-rib crank pulley. This is a replica of that. A standard E36 Dinan supercharger pulley is 5.14". Modest dimensional increase gains of 5.5" mean the potential for more boost if so desired. A standard E36 Dinan supercharger pulley has 6 ribs. Appreciable gains in belt grip and consistent boost pressure with this 8-rib design.  Plug and Play with the Dinan tensioner and pulley. Just add the 8-rib upper supercharger pulley and appropriate belt for your desired boost level and go.  Now includes the spacers required to square up the belt tensioner to the larger pulleys. Also included is a new tensioner pulley centering bushing and a supercharger pulley retainer (these are cosmetic inclusions to replace original steel components that are usually rusted or corroded).Known working configurations 5.5" 8-Rib ISR Crank Pulley + 3.33"