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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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"Speed, it seems to me, provides the one genuinely modern pleasure." - Aldous Huxley
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