In an article from the Dec,8 2004 of Canadian Auto Press by Trevor Homann.
A comparison of a 986, 986S and 987, 987S at the old Nurburging race track shows the following times.

2004 986 8 min 42 sec.
2004 986S 8 min 27 sec.

2005 987 8 min 31 sec
2005 987S 8 min 18 sec.

For all saying they would ONLY go from a 986S to a 987S, please note going from a 986S to a base 987 you would have lost almost Nothing...is it REALLY worth the extra $$? In the real world, I doubt it.I think you feel you must....