what size tires?
after finding out that the 40 was 1" taller than the 35s. I am lowered so I didnt need more tire to fill my wheel gap. If your not lowered you may actually want the 40 to help fill the gap. Also read the 1" diff in tire throws speedo off about 3mph, just keep that in mind or have it reset. The 285 is an option in the rear if you dont mind not being able to rotate tires.
Also, after researching Im probably going to run some sort of adapter/spacer to bring the rears out a little. The C6s I ordered have a 56mm offset.

