I had other things installed as a package price, but I would say $100 on the low side and $150 on the high side. It's about a 1.5 to 2 hour job.

Where can I buy a nismo exhaust? Also, compared to a stillen exhaust, which one do you think is better? (reliability.. ect)

You can order from any of the Vendors on this site, PM them for the best pricing.
As far as reliability is concerned, that's to be seen, know one has had them installed for more then a few months. I think it will come down to the type of Tone you are looking for. Watch the videos in the exhaust sound thread, this will help you decide.

why are you so suprised? its NISMO dude. if you can get it from the factory its not gonna be that great. (doesnt sound that great to me either) get the stillen or 5zigen. just my opinion

It's a lot of money for something that advertises 5hp when others comparably priced are advertising 3x that.

my point exactly especially since stillen (15hp increase. that 10 more than nismo) is cheaper and sounds better than the nismo. hmmm kinda seems like a no brainer. unless you just want to be able to say "i have nismo!" which i dont think is something to bragg about. thx frost

like minicobra said, it depends what your looking for. if your looking for tone then minicobra has the best combo IMO but if your looking for numbers then go with stillen. guys dont automatically assume he wants numbers. maybe he does, maybe he doesnt....but both are great exhausts!

i dunno why youd want to pay over a thousand dollars on something without getting something out of it. i mean if you just want sound i could record myself driving when i get my exhaust on this week and send it to you for free, and you could just play it through the speakers on repeat as your driving. lol. j/k