Sad news for those of us that love the N/A 6.3 motor which according to GTSpirit is being phased out in favor of a 4.0 Twin-Turbo unit for the next C63 AMG, also rumored is the 4.0T will be replacing the 5.5T across the lineup. Potential output for the new motor should be around 454-493 hp and have enough torque to match. The next showdown between the M3 and the C63 just got more interesting...