Personally, I love B6's. Excellent, top quality product. I don't have any opinion of them on stock springs, but Bilstein's have an excellent way of getting stiffer when they are bring worked hard. I found them slightly stiffer than regular upgrade shocks (H&R's, etc), but they really excelled when pushed harder. I think it's a really comfortable, but performance minded, shock. Can't go wrong with Bilstein sport's!