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DO NOT USE B6'S as a replacement for the RoW M030 suspension, the RoW M030 struts are a modified version of the B4's made specifically for Porsche and not sold separately, only as a kit. They are a shorter version of the B4's. The RoW M030 dampers and the US M030 dampers have exactly the same valving, the only difference is the piston length of the RoW; it is slightly shorter to accommodate the RoW M030 shorter springs.
So much misnformation going on here, I'm surprised that no one has ever contacted Bilstein about this. I contact Bilstein when I was re-doing the suspension on my car and one of the tech advisors commented on the suspension basics but would not give me any specifics on dampneng or springs rates . The closest to the ROW M030 struts are the B8's according to Bilstein.
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