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XFI Spring and Phaser Mods Required 221/228 Hydraulic Roller Finger Follower Cams for Ford 4.6/5.4L Modular 3V. Powerful Cam with great idle, excellent upgrade over stock. Good torque down low with powerful mid-range. Solid power gains above 4500 RPM, requires spring and phaser upgrade. Custom tuning required. Stock Gears and converter OK.
Legally, a vehicle manufacturer cannot void the warranty on a vehicle due to an aftermarket part unless they can prove that the aftermarket part caused or contributed to the failure in the vehicle (per the Magnuson Moss Warranty Act (15 U.S.C. 2302(C)).
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