Originally Posted by SamE30e
They work fine in my lowered E30.
Lowered does not necessarily mean performance. These struts are not valved for stiffer springs, they are valved for OE spring rates. Its that simple, sure it may work with your lowered springs whether they are stiffer than stock or not. However how well do they work with them and how long they last is another question. If your spring rates are stiffer than stock, the valving on these shocks do not match your spring rates, therefore they do not work properly, and your struts will blow quite prematurely.
I find a lot of people thinking tokico HP (blues) are performance struts, they are OE replacement, and in this case (BMW) of lower quality than OEM.