happen to ride quality?... Will I notice much rougher/harsher ride?... In my book the Sport Susp is rough enough... What do you all think?

in my opinion, the cosmetic benefits of the 18 inch RS4's drastically outweigh any difference in ride quality.

Because the S-line package includes the 18" wheels. When I had the 18" RS4 rep wheels on my car, it felt no different than stock. Braking and acceleration felt great still. 19" RS4 reps are a different story....

But the 19's aren't all that bad. It's all relative though.

they look so much better (I think)... I don't have the S-Line but maybe the dealer will let me drive one... Appreciate the input!

See link below<ul><li><a href="http://www.stratmosphere.com/strat_wheels.htm">http://www.stratmosphere.com/strat_wheels.htm</a</li></ul>

a diffrence from 17 to 18.