my recollection of riding it was from when it was essentially new, so there was that factor in there also, but it stands to reason that bigger rotors generally equal more braking force etc , dispersing of heat. I guess if I got the point that I needed to change a whole bunch of stuff on mine, I might consider it, but its handy that front and back are the same 160's, I kinda assumed there would be a pad size difference as well, but really dont know.
Are the pads larger? Same caliper?
Same everything except a different adapter to move the caliper to the correct position.