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Originally Posted by Number 3
GM isn't the only manufacturer with AFM. Fiat uses it on all their V8s if I'm not mistaken and even Honda uses it on their V6s.
The issue with AFM isn't cutting the cylinders off it's isolating the engine so you can't feel it. One of the biggest issues is the exhaust. As the engine shakes more in 4 cylinder mode, so does the exhaust and if it isn't isolated you can feel it.
You can barely feel it in the FS Pickups and SUVs. But go look at the Camaro exhaust. I think in 2011 they added one more flex coupling for a total of 4 I believe to try and better isolate the exhaust.
It's very tough to do when the exhaust is hanging off the body. The trucks have everything attached to the frame with one more level of isolation through the body mounts.
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I don't believe the 6.4 in the SRT8s has cylinder de-activation.
Another part of AFM that I think affects truck owners less than Camaro owners (and in particular, Camaro owners on this website) is aftermarket exhausts. I'm sure GM does what they can to eliminate the unpleasantness of the 3.1L V4 sound through careful exhaust tuning. But if you replace the muffler with one that isn't trying to minimize some of the bad frequencies (and instead might amplify a few of them), its not going to be a fun experience.