Ok, This is my newbie question. Is there any difference between an n36 manifold and an n33? If there is what is it and what year did the n33 come off of, can you notice the difference. I am using an n36 I bought an n33 so I can polish it and put it on I am just wondering if it will make a change or not, thanks for the help. Also if anyone is looking for a set of seat frames from a 1974 260z I have a set that I want to give away for free the seats are shot but the frames are good. For pick up only. Thank you.