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I've had one of these for over 6 months. I'm really happy with it. I had a 3.7 inch exhaust before with a test pipe, so it was pretty loud. I got a new 3 inch exhaust with this, so I can't make a pepsi challenge comparison, but I am really happy with it. It is quieter at low rpms, and it does open up when you hit the gas.
It's basically a 3 inch mushroom shaped plunger with a 1-1.5 inch hole in the center, so at low rpm is remains closed (exhaust passes through the small hole). You can see it best in the bottom pic. When you step on it, the plunger moves back, opening up to the full width of the pipe.
It does rattle slightly, but that's just when warming up the car and the rpms are up a little - like 2kish. It sounds like finger cymbals that belly dancers use. Not very bad and only noticeable to you.
It's rebuildable, too.
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