A cold air intake isn't going to do anything at all for performance, period.
Not unless you plan on opening up the cylinder heads with a good port job, and adding some properly sized long tube headers.
With the stock heads and exhaust manifold though, you'll gain ZERO from going to a cold air intake. I know what you're thinking, "But I've seen people say they gained 2-3 HP."
Nope, those are negligible gains which can be chalked up to nothing more than temperature variances, altitude, engine temp, and much more.
However, in the case of a supercharger, the stock airbox may not be possible to be re-used, in which case a CAI might be your only option.