those Roush Blowers are very under estimated. My freiend has a stage 3 and had it dyno'd in stock form and he made 357 hp & 350 TQ.
He took the car over to BBR and had them install their 2.57 blower pulley, 10% overdrive crank pulley, Steeda CAI, SCT X3, Afco Heat exchanger, and they tuned it...