When talking "cold air intake" let's clarify and add that a short pipe with a big fat cone filter in the engine bay is NOT beneficial... not unless you build a nice big box around the filter and feed the box air from outside the engine bay.
Also, while we're at it I'll add that the removal of the Helmholtz resonator is not beneficial. The resonator is not designed in such a way that it impairs the flow or air through the intake... in fact it helps it. For the same reason that it muffles sound it smooths the airflow: it eliminates turbulence.
Cat back, headers, different intake do make a difference, cams, tuning, porting and polishing make an even bigger one. Hitting 200 - 220 at the wheels with these mods shouldn't be too difficult, but getting much beyond that you're looking at more and more expensive engine work. My recommendation is to put together a list of mods which you'll be able to use on a turbo'd engine in the future, even if they don't make a big difference on your N/A.
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