A good friend of mine has just bought a 2006 06 A6 Allroad. It has DVD based Satnav fitted, can you play DVD's on this? Also the TV prep, do you need to fit an additional part for the TV to work? Does it work at all speeds? if not can you adjust it to work at all speeds.. Thanks Dodge Ps. Also any downsides with the 2.7 allroad?