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.

4G63 Turbo dump pipe EVO 7-9 Kinugawa
Border coilovers - S1 street series
BC Camshafts 3SGTE stage 2 / 3 