Funny. The prokit/Koni yellow are too hard for me too! Sometimes the dumps gets on my nerves, thus I might go to 17" summer rims this year (will see, economic down turn and all, and those falken 417 I have on there only had one summer on them).
Yup, wheel size does play a big part in ride quality. With my setup (pro-kit + koni's on full soft + trd yellow sways + 19's) the ride is fairly smooth until I hit a rough road... then it can get scary!
When I drove my car to storage with the stock 17's I was amazed with how smooth it road.
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