Here's my link. I can say for sure the phone is clipping some background noise. I just plopped my phone on top of the battery tray and gave 'er a bunch of rev's.
Again my complaint is that I can't hear much with the windows up. I can certainly hear it a little better with the windows down, and in parking garages and ramps it echos more. Still it's a big open filter and a metal 1 ft piece of tubing. I think because the entire intake tract is plastic with dampers there's not a lot more that can be made. I kind of hoped the eventuri "vortex" would make some more turbulence sound