(STAGE 2) Blower XFI™ NSR, XE261LH-16.5 Mid to Upper Range, Bolt-On Blowers, High Boost
XFI No Springs Required Blower 222/239 Hydraulic Roller Finger Follower Cams for Ford 4.6/5.4L Modular 3V. Mid to upper range cam for bolt-on blowers running higher boost psi. Major power gains above 4900 RPM, compatible with stock springs. Best with 3.73+ gears & 2500 stall. Great idle.