Only on the first 6 months of evo production and then deleted due to creaks and rattles, and they offer a great weight saving a must for any track/race car.
Odd, mine don't creak or rattle at all...
Don't suppose you know how much the weight difference is, by any chance?
I can imagine that would all add up to a big weight saving BUT... I'm thinking along the lines of a Kumho car, and I don't think that changing wings would be permitted.