VMP new 2.49" Roushcharged M90 Blower Pulley for 05-08 Mustang 4.6L 3V with Roush Blower that uses bolt on style pulley. Use of larger idler pulley recommended. New smaller design adds approximately 1/2-3/4lb of boost OVER the 2.57 pulley and 10hp/10tq, no tuning or other changes required. Adds 1-2psi more boost than the aftermarket pulley from Roush Performance. Tuning required or complete packages available.
