South Side Performance Aluminum Pulley Pkg Nissan R35 GT-R 09+ SSP has yet done it again. A new product that will free up some of the rotating mass of the GTR;s engine. SSP has built a fully functional part while making your GTR look great under the hood. All 3 pulleys are made to the exact factory specifications. They are built out of 6061 billet and are a direct bolt in and retain the factory belt.