To your point, I would stick with the 265/40-18 on the 987, there's no reason to go to a 265/35.
As far as the 986, the 265/40's are 1" taller than the OEM tires, I would verify that others have run them without issue. Of course, you could just swap wheels for a while, and do a little "testing" to see if there is any ABS problems. You would probably have to live with the speedo being off.
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