Originally had a Mishimoto performance CAI, and swapped to the Skunk2 Powerbox after deciding I didn't want to have to take my bumper on and off to do clean the air filter. The construction is solid. And fits very nicely in the engine bay. I'm on the stock tune, so I'm using the restrictor for now.
Coming from the Mishimoto, this thing hardly makes an induction noise. I was used to the Mishimoto screaming in the cabin when you stepped on it. In comparison, this doesn't make a sound. However, after driving with it installed for a week or two now, it definitely makes deeper sound when it's floored. Overall I like it.