The're Graphite not black!!
Had mine done at Performance Torque in Wolverhampton who i used for my old 1.8T engines. Will is a very knowledgeable chap, basically the torque limiters are let slightly lower to save the clutch. Makes a noticeable difference though and well worth doing.
Didn't get a RR result as he doesn't have a 4WD RR,but i know his maps are good for 170-175 bhp and 270 lbs/ft torque.
He told me the map on the quattro would relate to 165-170bhp but its the torque which is limited to save the clutch.
Well worth doing.
Official Fan Club member No 001!!