Yeah, I saw your post John, but I don't know if I can give you a scientific answer. I've had the Balo (front) rotors for about a year. They're now (18,000 miles later) barely starting to feel like they're warping. But it could be caused by uneven tightening of the lugs. Thus I can't say it's the rotor's fault. They were the plain, non-drilled, vented type. I got them from germanautoparts.com I believe. Around $45 each. I'm going with OEM Volvo rotors and pads next time and I'll use a torque wrench on the lug nuts to see how that works out.
-Chris '95 855t
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