(STAGE 1) Blower XFI™ NSR, XE253LH-15 Excellent Mid-Range, Bolt-On Blowers, Stock Boost Levels
XFI No Springs Required Blower 214/231 SOHC Hydraulic Roller Finger Follower Cams for Ford 4.6/5.4L Modular 3V. Excellent mid-range cam for bolt-on blowers with stock boost levels. Great power gains above 4700 RPM, compatible with stock springs. Best with stock gears.