I have been happy with the Monroe strut insert for most of the German street cars. I cut one coil from the fronts, that gives the minus 1.5-2 in. and struts can handle this new, slightly higher spring rate. Advance sells them with a lifetime deal. Stay away from the sliver KYB, (way to soft, IMHO. ) The Monroes are much better. (I have a stack of pretty new KYB take outs.)
I go straight to Billy and race springs for any track cars . The Billys do work nice on the street, in a smooth, warm climate. HTH, MM