dont go with 40s, the ride is very rough compared to the 45s (i went from 40s to 45s). the step down isnt worth it in my opinion...but wait if u step down from 45 to 40 doesnt that mean u can also increase tire width to 215? id defenetly look into that (if its right...from wat i understand from my "tire profile" post it is...)

id go with the yokos