Being an AB, i'd guess it's some kind of premium fabric as can be chosen instead of full leather so must be made of something lovely or everyone would spec the full leather.
As for engines, the RRS can be had with the SDV6 engine which is just over 300bhp & this is due to having an extra turbo, although could be other differences to the internals, however i believe they're other than the extra turbo, basically the same engine.
The SDV6 isn't available on the FFRR which i found strange, however the difference in performance even in the different vehicles is negligible, but the TDV6 has the better economy. Paul
MY17 TDV6 Autobiography In Carpathian Grey With Cirrus Interior
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