Where are you getting the info re the boost cut, I don't think it's true!

@ 7K you will activate a hard cut (This is information from the handbook, so factual)

Above 6,800 RPM every second FI pulse is missed and the boost pressure is reduced by 0.3 BAR (4.5 ibf/in) I think this is what you are referring to, it's certainly not 6000 RPM lol, they don't make peak power until then.

They were known for the official Ford quote, although they may be a little shy of this in some cases, also the acceleration figures vary depending on where you look.

Martin