These light weight alloy CnC machined pullies will provide reduced rotating mass compared to the stock pulley and save you precious horsepower throughout the rev range. They also under-drive attached accessories. Suit 4G93 as found in the lancer GSR and Libero.

Lucas 75w90 Synthetic Gear Oil 4.7L (trans and diff)
BC Camshafts B16a B18c stage 2 / 2+ / 3 