The Under-drive Crank Pulley with new belt for the Mitsubishi EVO VIII & IX. Like all GFB pulleys, the material used is HIGH GRADE 6000 series aluminium alloy billet, which nets a large weight saving of 3.1 LBS over the factory pulley, without sacrificing strength or reliability. The kit comes complete with the required serpentine belt, and installation is simple as no specialized tools are required and it can be done in as little as 30 minutes. The accessories are under-driven by 20%, which does NOT compromise their performance at low RPM, but does help reduce parasitic losses at high RPM. Like all GFB lightweight under-drive pulleys, the improvement to the car is felt in the form of sharper throttle response (particularly off boost), and the engine feels more willing to rev.