If this hasn't been posted, yeah, not an S63, but still interesting!
As we know, some of the differences between the N & S are:
• Engine tune (X5M +77 hp, +0 tq; winds +1k rpm -- CP +17hp)
• Transmission tune (X5M adds 4wd "sport" mode & slightly faster shifting)
• X5M adds different piston crown for better cooling
• X5M adds additional engine/transmission oil cooler
• X5M adds 2nd oil sump, completely different oil cooling
• X5M adds different engine & transmission mounts