With respect to what size to run. I would believe michelin trumps all. I would follow their recommendations. To the dude who says his mechanic can mount them, that means exactly squat.
Just because something is possible does not mean its desirable. Perhaps you can mount a 225 on a 9.5"...
Why ruin a perfectly good suspension stock. Why not drive it first and see if you need a better suspension. The stock limits are quite high for the MS3. If you are lowering and putting overly fat tires on for looks only, then your lost and have been swallowed up by the wider is better ignorance.