Fair enough. That drops is to about 7-8%. It's generally accepted that a gain of 8-10% is needed to be noticeable, so maybe.The OP above making the changes has a 3.6.
Hence my comment about the placebo effect.Regardless, most of these induction/exhaust type changes people make may increase the peak flow numbers slightly, but that will only show at high rpm. Noise will increase, though, and many equate that with a performance gain.