I have STs on my b5 s4. The stiffness is as close as I've felt to stock and I can tuck my stockies both front and rear.

As far as the clunking problem, I've been put in touch with an ST rep for warranty replacement. They send you out a little chart where they ask for your ride height (hub to fender). I think they're seeing this problem (usually on pass/rear side) at lower heights. Haven't heard what the verdict is yet.

All in all I'm very happy with them. If this doesn't get taken care of, ill switch to v1s. I went with STs because we don't have rust issues in colorado.

I bought mine through AMI and literally have NEVER had a better customer service experience. Excellent guys to work with!!