Adam in WI
Practically lives here
How would GM handle a warranty claim if one of these had been installed? ("They'll never know" is not an answer.)
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If they deny any warranty claim, sue them for violation of the Magnusson Moss Act. Since the device does nothing more than simply keep the engine in it's default V8 mode, any lifter failure that occurs would've happened regardless of if it was ever allowed to go to V4 mode or not.