I have an 06 STS V8 with the staggered setup (18in wheels). Came with Michelin's from the factory. Replaced them with Pirelli PZeros this past summer. The Pirellis offer a much more compliant ride - i think you lose a bit of the tight cornering as a result. They seem stickier as well - not something I would use in snowy conditions, but seem to get the job done our Pacific NW rainy weather..