i run 215/40/16's as well on my 16x8's and they're perfect. little smaller then stock 185/65/14, but it leaves more room for a drop and only affects the speedo by about 3%I have 215/40/16's on my car. It's not lowered yet but they fit the car extremely well.
^This... Stick with the right tire size. 205/45R16 is what you should go with.205/45/16 would be a better choice and keep your actual speed closer to what your speedo reads.