10" is the max you can go with the OEM's. If you wana do it right order the 12"s the factory spaghetti is plenty long enough to pull Threw and just change out your lines no cuttin and soldering! Don't bother with the supper size kit either. Get your own fittings, lines, shrink tubing and fluids. You'll be better off. Check the finish of the bars right at the dealer or if you order direct the day they arrive for flaws. Wish I did left them wrapped up till the end of last years winter project list and found two rings in the chrome! Use 45 degree banjos at the controls to help the lines flow better with the lines of the bars. The kit comes with straight banjos"which look dumb", and a full wiring kit which you don't need and get a set of gooden tight bushings even tho the people that make the bars don't recommend that you need them. Thats the way to do it, and you'll be mint and save a couple hundred in parts and three or four in labor. Thats a new set of cams and a good tune think about that.