They FIT Put my 1 3/4" Sanderson Long tubes in tonight. Minor dimpling on the drivers side to clear the steering shaft, and they barely touch the JTR engine mount. driver side goes in with removal of the shaft. Passenger side goes in with the removal of the engine mount. Collectors come out about half way betwenn the bell housing and the frame rail, just right, and easily clear the floor. Sanderson doesn't say they they fit the 280Z in the add, but they do. They were $405 shipped to my door. I am very happy and the quality is about the same or a little better than the S&S 1 3/4 tubes. Took about 2.5 hours for just the headers and the clearance with a lift. forgot to check spark plug clearance since I run angle plug heads, but I'm sure they will since they advertise that they will clear. Pics to follow.