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XFI Spring and Phaser Mods Required Blower 245/256 Hydraulic Roller Finger Follower Cams for Ford 4.6/5.4L Modular 3V. Max effort blower Cam with very rough idle, needs ported heads. Great mid-range power with incredible gains up to 7000+ RPM. Solid power gains above 4900 RPM, requires spring and phaser upgrade. Custom tuning required. 4.10+ Gears and 3200+ Stall.
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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