Here is Lifter (AFM) Solution on 2021+

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TrueAt1stLight

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Here is your current solution to AFM with a few other benefits. 2021 Yukon AT4

View attachment 390887
Slow down with the details! :) Did you have the lifters replaced with aftermarket? What about DFM: still engaging? Oh, and what’s that funny looking wheel thing: a fuel economy enhancer???
 
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lasallen

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Slow down with the details! :) Did you have the lifters replaced with aftermarket? What about DFM: still engaging? Oh, and what’s that funny looking wheel thing: a fuel economy enhancer???
;);), still original lifters. Active Fuel Management is disabled.
 

TrueAt1stLight

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Looks like Whipple charges just under $11k including the PCM unlock. Did you have a dealer do the install? Open to sharing a ballpark of the install fees? I’m guessing this definitely voids the factory warranty but curious if Whipple offers one.
 

66 Galaxie

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Nice! Please post a review of the whipple install and how you like it.

Is AFM disable standard with the whipple or did you need to request it?
 

H1Chester

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Hennessy Motorsports recently posted on their Instagram page that they had supercharger packages for late model GM 2021+ SUVs.

Sounds like the tuning code has been cracked?
 

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