The F8x damptronic B4s look like twin-tube shocks to me based on the PNs. I don't know how much I trust they're valved similarly to OE. I don't trust Bilstein much in general looking at how crappy of a job they did with F2x and F3x applications (they recommend the same damper and coilover PNs for a lightweight 230ix as they do for a heavy 340ix GT).
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