Got Dinan Shockwave software installed today and I can pretty much say WoW what a difference. I have a 2011 550i w/ M Sport w/ ARS and ACS Springs. I drove 60 miles home on Normal mode and this mode felt firmer than under the stock Sport mode. Switched it to the new Sport mode but couldn't tell the difference since the highway was pretty straight. Once I got closer to home I decided to try the car on a familiar downhill that has a sharp left turn. The first try was under Normal mode and the car did not have any body roll whatsoever. Then decided to try it under the new Sport mode. The car felt even tighter at the turn that made me feel confident to speed up a little bit to I point where I felt the Continental DWS All Season tires I had on was giving way. I have not tried the Comfort mode or the Sport+ mode yet. IMHO I think this mod is worth every penny Dinan is asking for and its the one of the several things they offer that is under $1k installed under 30 minutes.
2011 550i M-Sport Carbon Black// Dinan Stage 3// Meisterschaft GTC Exhaust.