If I were you... i would let my C63 stock, the time you are stunned by its power, the time to get used to it, the time to learn the car and to loose the "surprise" effect.

When you begin to feel that you are used to the power of the car, to its incredible motor, then you go for a remap... And you have a new car, even if it is always the same!!! You will really feel the difference, really appreciate the remap, and fall in love with the car a seconf time.

If you remap the car before really having driven it, you won"t feel the difference, and will only have one new car instead of two...