The S63 and the N63 are 4.4-liter V8 engines made by BMW and installed into its vehicles. While these two V8 engines have several similarities, they also have significant differences. Let's start ...

BMW bought Rolls-Royce in 1998 ... The S68 was designed to replace the S63 in the M engine lineup after the latter was forcibly retired due to changing emissions regulations.

Based on the BMW 750Li long wheelbase ... and those rear wheels are designed to steer slightly for better cornering performance. Moving on to the S63, the same engine delivers a massive 450kW/900Nm.