We don"t spend much time on performance discussions (I know there is a performance and tuning section) relating to the W212 350 or 550, has anyone done anything to get a little more power like have the software moded or ? It would be nice to get a little more out of these cars.

It would be nice to boost it by 10 + %

FTB

 

Wish I could make the exhaust system on my 2011 E550 Sport Sedan sound like my wifes 2010 E550 Coupe. It sounds awesome!!

 

10% is a good average. for your 550, you might get just below 10%. Here's my dynoresults from tuning, but it's a different platform.
https://mbworld.org/forums/w212-amg/...-day-100f.html