I went ahead and tossed on the 275/40/19's, hopefully I wont regret it but tires are temporary I guess. So far I can tell the Michelins ride a bit firmer but they also seem more communicative and responsive. It didnt help the nose high look of the car but I think it will handle more neutral in the corners. My next track event is March so I'll know more then. Pirelli's with 400 miles are up for sale if anyone wants them! Figured I'd post the pics in case anyone else was considering the same thing.