It fit on my bike without mods, although you'll have to take the rear seat cowl off if you have your luggage rack on. Some people have needed to swap the seat pan.
It is a lower, firmer seat than the stock C-14 seat. It also feels... flatter at least to me, but for me it was too firm.
You have to get a ZX header , go to a ZX14 forum and check the for sale section, I bought one for $50.00 + shipping. Then when you install the left side muffler you will have to make a little tab to mount it.