D to DS is just a software change, so all your car should do is drop 2 or 3 gears for higher revs.
How odd. Must not've liked the downchange!
Let us know how it goes.
2006 BMW E60 520d SE 6MT
2009 BMW E90-LCI 330d SE 6MT
Current: 2012 F30 328i Luxury 8AT
2015 Audi A6 Avant Ultra, Black Edition (sorry!)