I have seen many people claim that with any given set-up you will make more power/torque over the entire powerband by using a Velocity Stack. And I have seen quite a few dyno sheets and with a price around $50, why not?

I have a DA integra with a 2.5" intake pipe and have probably never seen a 3" intake made for a DA. Now I know that the filter inlet size is 6" and connects to a reducer that brings it down to 3", But then I would need to reduce it again to 2.5" to fit my intake pipe diameter.

Now my question is will I lose all the effects of the Velocity Stack by bringing it down to 2.5" or would I still be able to make gains throughout my power band ?