I put a 111 in an FXR several years ago and it is a great swap. It is smooth and does not have the internal noises that really don't hurt anything but make you think something's wrong. Gas mileage isn't too bad, either.
I found the 585 cam to be "cammy" in that the power came on suddenly about 3000 RPM. Not bad, but I want it to come in sooner and not have it as a toggle, either on or off. Went to a T-Man 590 cam and it was strong all around. Stock compression is nominally about 9.8 and the 590 cam likes at least 10.5, so some power was left on the table there.
No real changes to the bike, other than I had problems with the electric compression releases and changed to manual. IIRC, the 111 is slightly shorter than the stock Evo engine. I know there were no fit issues at all.
The 111 is -nice-. It has ribs cast into the cylinders to cut down on noise, and has oil squirters on the bottoms of the pistons like Twinkies. The connecting rods are TC length, for better rod angularity and less side thrust on the pistons against the cylinder walls. Very good tractable street engine. If you get bored, a good cam, raised compression, and some headwork will put you up around 130 HP, so it is a good starting point for a strong build.
I kept the primary stock, no reason to change. As for a pipe, I think 2" primary pipes is too big for this engine, at least for a stock street build, so stick with 1 3/4. I like the performance of 2->1 pipes, so Supertrapp, D&D, and if you can find a good White E-Pipe, any of these will give you something you will be happy with.
Just put a good pipe on it and stay away from drag pipes.
