The 903 is in. I had to modify the left side engine bay to fit header. The reverse rotation crank gear set had to be shimmed out about 17mm for the crank pulley, I used the old crank chain pulley cut down. I will mount the remote oil filter, and 180 degree U pipe to the header collector so the muffler is pointed in the right direction. Also the starter has to be modified to fit with out hitting the 850 pressure plate.