This is a "global" car, meaning it is designed to be in compliance with noise restrictions in all countries. That is the reason there is a "symposer" which pipes intake noise into the cabin instead of having a loud exhaust.
It's also why more and more car manufactuers are actually piping "fake noise" through the stereo speakers. This is to provide the driver the feeling that he is making a racket while the rest of the public sleep undisturbed in their beds at night. (Including ford, apparently for the new ST in Europe, as the symposer is "gone" and instead the sound is manufactured and piped through the stereo....)
So no, revving it up will not make any appreciable noise unless you put an aftermarket exhaust on it.
The RS "snap crackle pop" is actually a tune that is enabled when you go in sport mode that is the result of engine software that sparks fuel in the combustion chamber while the cylinder head’s exhaust valve is open.
I am sure you can get tunes and parts that make the car louder, but based on the stock setup, the car is designed to sound louder inside than outside.....Go figure....