first of all you have to remove the HICAS system. Secondly I am going to redesign some rear lower control arms to allow wider rear wheels and tires. Still may be limited by the shock...but 11 inches should definitly be possible. It's not going to happen for a little while though. I have to remove the lower control arms and measure all the angles and try having some made up with a bigger "knotch" in them so that wider wheels will fit.