I have a friend selling an hks exhaust from his 350z. Can I buy this and direct bolt it on or are they different?

You will need to get the extensions or have a shop do it. The 350Z has a shorter exhaust system.

^ +1, extension will be needed, please search next time, a thread like this was discussed literally last week.

i have the hks system off of a 350 z and it was a little shorter and if you run your car hard for any period of time you can melt some of your bumper where the stock exhaust sat before but other than that it was the best exhaust i have put on my car.

must have been mega sunken in and terrible fit seeing that the 350z exhaust is about 6" shorter

i am assuming it came from a 350z at least that is what i was told but in my car it is only sunk in maybe 3 inches but i also have different headers