will i be able to hit 400 whp/

 

I've never seen that. I've seen around 320 with the aftercooler.

 

We have a Forced Induction forum for this sort of thing. Moving.

 

Sure 400whp no problem, How long do you want it to last? How deep are your pockets? I think the Comptech max boost capacity is about 14-15psi. That should get you close but, if you do nothing else I expect your motor to last about... not very long

 

with that in mind. inline pro is running 18psi for 18k miles so far so good? with a built bottom end and a good flowing head wouldn't it reliable?

 

Maybe, depends on how the bottom end is built. Low compression, titanium rods,"Alaniz" head, "Ultimate Lurker" for tuning. That is probably easily $15k or more in parts alone not to mention with that much HP your going to be breaking other things like the transmission, differential, halfshafts. But, it can be done. If you want to go that way I would follow what "Sideways" has done. I think he puts down 440 whp or so with vortech at 14-15psi and 10,000rpm IIRC,and seems to be reliable from what he has said here.
Like I said how much do you want to spend? You can either have cheap$ or reliability.You cannot have both if you need that much hp in your S.

 

If that is on a stock bottom end with no head work I have to say

 

400 whp I would say no. Unless you do a fully built motor.

 

Which car is this?

Since the S2000's internals are already forged, you can def do the Alaniz head and a headgasket, max the Novi 1000 out and you will see 400. This is what I am planning to do so I will let you know how it goes.