Lightweight Alloy - Crankshaft Pulley - Oversize - MR2 & Levin Supercharger 4A-GZEAlloy 176mm Crank Pulley Increases boost pressure by driving the supercharger faster. Harmonically balanced High quality CNC machining. Light weight to reduce parasitic power loss We recommend using quality spark plugs 1 grade colder than standard. Note: You will also require Belt 5PK970 available in the service section and Undersize Idler Pulley Note: On some engines you will need to remove the timing pointers on the plastic cover, we suggest you re