If you insist on boosting it, here is what your options are:
Turbonetics just made a very nice kit, that seems to be safe, and produce impressive #'s overall. Go to their website, and read up about it, there are also quite a few topics about it on both www.b15sentra.net and www.TheVboard.com just search Turbonetics, and it should come up. IIRC you are looking at mid to high 200's on whp/wtq, at I believe...8 pounds? You will have to verify all of that though, but like I said, just hit up their website, and they will have all of the info you need. They also have really good customer service, so call if you have any Q's.
Another option is to do what is refered to as the "VQ Swap" meaning that a VQ35 6 cylinder motor is put into the Spec V replacing the stock 4 cylinder QR25. This is going to be a hugely popular swap here shortly once people start finding out about it, kind of like the SR20 -> 240sx. So far, there has been about 4 or 5 successful swaps, the man doing it is named Travis, and you can find him either at TheVboard, or at B15sentra. The great thing about the VQ swap is a semi-bolted VQ Spec V, with drag radials and proper suspension set up, is capable for low 12's if the driver knows what he is doing, 11's with juice! Not to mention, it is EXTREMELY RELIABLE since the car will not be running any type of forced induction (not enough room in the engine bay) and the VQ is also a potent and strong motor! This is my personal reccomendation to you. IIRC it runs about 8 G's for everything which seems pricey, but a decent turbo set up would run about the same (after everything, i.e. upgraded fuel system, internals, etc etc), and be more risky on your overall fragile stock motor. QR's were unfortunately not really meant to be boosted, though if you know what you are doing-(very important), and can maintain it with knowledge and $-(lots!) they are fun as hell due to the extreme torque you will experience (bye bye honda's lol JK)
The final option you are looking at is a supercharger kit released by a company called Revolution Autoworks. They are a small company that has both a 3.8 psi, and 8 psi Supercharger kit that also puts down impressive numbers. There have about 3 or 4 cars running around with these on, and customers have so far been pretty impressed with the built quality, and horsepower #'s. This, IMO would be a safer alternative to a turbo kit, especially if you went for the 3.8 psi version, not to mention IIRC these run about mid to high $3's in price, which is very reasonbale for what you would be getting out of it (mid to high 13 second car, low 13 if you can drive)
That is really about it. There are more companies making things here and there, but those 3 are everything that are worth a damn to be straight up with you. Please becareful, there are so many things that can go wrong when trying to boost the QR. I hate to say this, but if you bought this car thinking you could slap a turbo kit on without spending money on building/fortifying your motor, you made a big mistake, these motors are known to blow at as little as 5 psi on stock internals. Even with a built motor, they can blow at anything past 8, esepcially if you do not loctite your Butterfly screws (if you do not know what I mean by this, you have A LOT of searching to do my friend!) So assuming you HAVE to boost it, here is what I would do if I were you:
SEARCH SEARCH SEARCH over at b15sentra, TheVboard, and MySpecV.com (there is a guy I know named Gurov there who knows his shit, and he is the Forum Admin, really nice he is) After you have searched, and read and learned about everything I just told you about, you need to make a decision thinking about long term effects it could have. Yes, you could boost your car now on 8 psi and probably be fine for a while, but it will greatly effect the longevity of the motor, and probably eventually blow at THE WORST MOST INCONVIENT TIME when you need it the most, so keep all of that in mind. If it were me, I would save up, spend the $8,000 on the VQ swap and have a bad ass 6 cylinder spec v that can eat stock Evo's and Sti's (STOCK...mind you!) so ya, I hope this helps man. Just remember, search those forums, learn about your car first, otherwise you will fuck yourself in the longrun. If you have any Q's let me know, I obviously don't mind helping out another Spec driver!
PS I didnt proofread due to being tired so sorry if it does not flow well
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