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I haven't been a fan of Bilstiens, at least in the OEM application. These shocks failed really early in my '98 Chev K1500 Z71, and in my '04 Avalanche Z71. This is a common complaint on all of the GM enthusiast boards I frequent as well.
Maybe GM got Bilstien to dumb-down the shocks to make them cheaper in the OEM application.
I replaced them in each case with Rancho's and have been really pleased. In the case of the Avalanche, I installed RS9000's all around. These shocks have dials on them so you can set the desired stiffness. Apparently they are a really long-lived shock as well.
Interesting, in the BMW world Bilstein's are pretty popular...I run the M3 struts in front and Bilstein sport's re-valved at 25% stiffer in the rear on my `97 318ti (I have a custom spring rate also, 450/550).
Also the Bilstein (not sure if HD or sports) on my brother's 325is seem to be holding up decently ~60k miles on them.