Mine has an MSL remap. (Well, actually a Big Fish Tuning remap, but the dyno work was done at MSL; I understand MSL now do all their own, including the map, but I doubt they'll be inferior). I had a 2014 E350 CDI with a TDI Tuning box on it (fitted it myself), but although TDI claim the same peak power and torque, the difference between the box and the MSL remap on my 2013 CLS is very evident; the remap is far superior.