It is not necessary to go the KunDalini way. Whatever path you take, whatever method of upAsanA (spiritual worship) you follow, without having to go through the regimen of the KunDalini yoga, if you sincerely follow any one path with an one-pointed faith, you will, when you reach a certain advanced stage, get those breathing-in and breathing-out experiences exactly as you would, in a yoga sAdhanA, all by itself.
You may not even feel it. It will get transformed by itself. In a still more advanced stage, when we are in one-ness with the object of our upAsanA, the breathing may even be stationary in the kumbhaka state.