emautner

I'm interested in purchasing carlsson 2/6 wheels (18x8 front and 18x9 rear) to replace the 17" wheels on my 2003 c230k. I have a couple of concerns. The first is how much will the ride quality and driveability suffer as a result; I don't want the ride to be harsh or loud. The other is weight. Does anyone know how much the factory 17" wheels weigh, and how much both sizes of Carlsson 2/6's weigh? Also, if I do go with the 18" wheels, what tires are the quietest? Any suggestions/help would be greatly appreciated.