I think the tendency of the 615s to follow the road contours etc. would make them somewhat annoying on a daily driver in addition to the stiffness. Think about how your STI feels on the RE070s on the area roads. The lower tighter C4 will probably feel worse especially with the stiff sidewalls.
Now if you have 2 sets of rims, and are thinking about autocrossing the C4, that's a different story. 615s all the way!
What sizes does the C4 use, and we can look what's out there for it.
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