Yes, you've found the S6+ setup... Those calipers you're asking about are the HP2 calipers, which showed up here on the neuS4 and A6/2.7tt and 4.2. I have no experience with HP2 brakes or their conversions (most popular is StopTech for the neuS4 crowd). I suspect there are fewer brake pad options compared to the 993tt BR calipers.