an intake isnt as loud as people think, ofcourse driving in boost, WOT will have an increase in noise but a charged car doesnt roar like an N/A car. Its more suction and chatter thats achieved.
driving normally, the difference is minimal. untill the drive gets spirited does it make a difference, and yet its not that much. i love the noise of my Neuspeed P-Flo, i dont think i could put the OEM back on now.