I bought a Volant CAI and installed it yesterday. Took about an hour. There weren't installation instructions included, but it wasn't difficult. I got the model with the Donaldson PowerCore dry filter (there are two filter options). Part number is 161576. The only difficult part of the installation was getting the mass airflow sensor to go into the grommet properly. After a few tries, I got it to work.
I went for a quick test drive, and it does make a nice growling sound when you give 'er some gas. I like it. It's not obnoxiously loud.
I will note that from the top, it looks like a totally enclosed "box", but it's really just a plastic heatshield. I'm happy with it so far.