I have a c350 AMG 307bhp 2 door 2011 the first thing you must do is buy a K&N air filter the other thing is you must use the flappy paddle (in high RPM) don't let it change gear by just putting your foot down..so do this when you won't too change up flick the padded and take your foot off the accelerator (usa the gas) it will change gear when you want it to and quickly in high RPM its a much better experience.
