It will hold. The torque is what matters.
HP is the product of torque, compounded by engine speed. They keep the torque "low" by clearly ramping in the boost with engine speed.
On the street, the Z will never hook up well enough to load the engine to this power anyway. Consider that the car will rarely have the opportunity to load the engine this much on the street, and how limited the track mileage will be relative... the engine has a shot at lasting quite a long time IMHO.
I say well done.
Hopefully this will inspire a lot of you guys to move to the good gas (e85) and buy lots of fuel systems (
) and get a real boost controller in your cars and start cranking that power. This car will be insanely quick if they decide to take it to the track. I think I read its a T1 employees car... so we might start seeing a 370z actually get put to work in some high-power activities!