That may be a good call on going to 17" wheels with a 2.7L Boxster. I have stock 17" wheels on my 2000 2.7L and just got a set of aftermarket 18" Carrera wheels. The aftermarket wheels look great, but they weigh in at about 3 lbs heavier and 3/8" greater in diameter than the stock wheels and I can feel the difference. Even with that small of a difference in the rotating mass the car does not feel as quick. Now, if you could get some very lightwieght 18" or better yet 17", that would be a whole different story....
Ed
