Most tire manfuacturers recommend at least a 9.0" wide wheel for a 275/40-17 and a 9.5" wide wheel for a 285/40-17. An example of the guidelines from the Yokohama website:
QUOTE
RIM/WHEEL WIDTH
Each Yokohama tire has a specific rim width range on which the tire can be mounted. Failure to follow rim width recommendations may result in poor tire performance or possible wheel and/or tire failure.
Whether they will rub depends on the offset. Keep in mind that the stock wheels and tires on the WS6 and SS coupes are 17x9.0" 50mm offset with 275/40-17. The chassis is designed to accept the 275's. The most popular upgrade is a 17x9.5" wide wheel with the 275's. As long as you keep the offset on a 9.5" wide wheel in the range of 45-56mm, you will not have any rubbing problems.
For even wider tires, you can fit a 17x11.0" 50mm offset in the back, with 315/35-17 tires. May require a bit of hammering on the inner fenders, and trimming the projecting edge off the jounce bumper bracket.
315 on the left, 275 on the right:

315's from the back: