Almost every brand these days has mastered the mid-cycle facelift. A quick update or two a little more than half way in to the product's lifespan to keep the model fresh and the newer competition at bay. Often this yields little more than some new lights, bumpers and other easily changeable pieces. It's rare to see significant powertrain changes for the mid-cycle facelift but occasionally automakers will have a strong urge to yank out the old and put in something completely different. At times patience runs out even before the scheduled facelift. Here are a few of the most dramatic "in generation" powertrain changes with some surprising and amazing results.
Mercedes Benz E55 to E63 AMG
It's especially rare to see an engine change for a high performance version considering the limited volume at play but that is exactly what Mercedes did when it went from a supercharged 5.4 liter V8 to a sweet sounding naturally aspirated 6.3 liter V8 for the last generation E Class AMG.
What is your favorite "early" powertrain update?
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