Good day, Google can unfortunately not answer my questions sufficiently, so I turn to you in mid-March I change my current SLK against the 55 AMG, which was however already built and no configuration is possible anymore. The leasing offer was simply a corner better why I left my special wishes out of consideration. It does not include the following, which I unfortunately only saw too late : – AMG Performance suspension – AMG Performance braking system Question: How very un Does this differ from the normal AMG chassis and braking system? My last two questions: – What possibilities are there still to change at the sound volume without changing the original AMG optics? I would like to have it a bit “lauter”. – The tuner Cargraphic offers an increase in performance (control unit ), +25hp/+50NM. To what extent are such values guaranteed and above all the new car guarantee immediately extinguished? Thank you for answers, greetings from Landau