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Cold air intake is one of the most useless things to do, but an essential part of the supporting things to do when performing the full "bolt-on" swap. On paper it adds a hair of power, but it is not noticeable. Combined with other things it helps the overall performance and something that probably works better if done last. Usually the first, and most noticeable, thing generally starts with a tune.
Sound typically is not synonymous with power. Loud != fast. And the S63 (especially in the X's) have never been known for their exhaust note.. matter of fact it's a bit lacking.
Judging from what you are describing, you want your car to be hard parked as spacers are useless. Save your money, get a tune [spacers if you want], buy some cheap fart cannon (like a megan exhaust) and call it a day.
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