Thats the new engine... a standard N63 does not look like that, and the new Valvetronic motors aren't the large toroidal rotor designs used in the old engines. They are much smaller, neodymium core motors. They take up 10% of the space!
And added boost, does not instantly "boost" HP figures. Other things have to come into play to get better overall performance and "figures"! Besides there's so many different factors being handled by this new MS DME, including a new M-Valvetronic program. They can use 30psi to make 400hp if they wanted too... mpg anyone! lol!
Now just imagine the capabilities of them flipping the control values, the other way around! They could use the same 22 psi, to push more than 600! Easy!