In this video review, I will compare the Mercedes-AMG M156 6.3 engine to the M113K 5.5 Kompressor engine and see which is best. I will look at technology & design, sound, performance, and reliability before concluding with which of these two engines is best in my opinion. The M156 was in cars like the C63, E63, and CLK63 while the M113k was in the E55 and SL55.

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