B6 is for stock ride-height, B8 is for lowered cars. The B6 are sold as "HD" here in the US, the B8 are sold as "Sport" (or "SP").
From what I read on this website the difference in ride height between Legacy and Outback comes from both
a) larger wheels on the Outback
b) longer struts
If that is true, I don't see how struts that are designed for the Legacy will fit on the Outback without lowering the car. The parts VE3-B830, 831 and BE5-B832 are available in the US and others on this website have mounted these on their Legacys (just search for the part number) without raising their cars. I don't want to sound like Captain Bummer but I think the German route will not give us anything that we don't already have available in the US.
Regarding the group buy on the BTS kit from Japan, a couple of questions:
1) What about customs/duty?
2) Should we offer to pay $15000 for 10 kits (incl. all shipping, duties, etc)?
3) I assume the seller would ship to a single address in the US. How much would shipping be from that address to the final buyer, assuming they're all in the lower 48?