I got the intake in the mail about a week after I ordered it. The install was fairly straight forward. However, I ended up sliding the whole apparatus in opposite from the way the instructions suggested.

It basically sounds the same to me until you hit about 3,000 RPM and then it opens up a little more and you can hear more noise from the engine bay. You could definitely pass it for stock however, it's not super loud by any means.

I have the Stillen exhaust as well and I didn't really notice any difference in the exhaust note but I didn't really do a before and after listening test or anything.

Here are the pics.
Parts


Before


After

 

nice! one of the few aftermarket intakes i would choose over oem.

 

thanks