I can see where inforNOS is coming from, but that statement is strictly not true. A louder crossover can come purely as a result of material changes and therefore produce no change in power delivery. You could replace your stock intake arm with a metal one connected to the airbox, remove some of the resonator piping and you would have a much louder cross over with no change in power band.

A cold air intake will give you a louder cross over because of the materials usually involved (a metal intake pipe and pod filter), and whilst it will also change your power delivery, it's not because it is louder. If you ran the same length pipe except in plastic, you would produce the same power in the same areas with a quieter cross over.

What infurNOS said can easily apply in other areas though.