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Based on what I've read:
The Tornado system...(which is basically a fan-blade that funnels air into the box in a tornado shape) does increase HP based on dyno tests. (Apparently 8 to 12 HP) The amount of power varies based on your car. It does also save in fuel by apparently providing a better air/fuel mixture. Both differences are said to be more pronounced on American make cars, rather than imports...however the explanation behind this is unclear. (Something to do with the torque-iness of American models I believe...) If someone understands the reasoning, an explanation would be greatly appreciated.
The Z-Max system also produces slight gains (said to be in the 5 to 10 HP range) however I have not seen dyno information on this. From what I've read these gains are more pronounced in older model cars that do not operate as efficiently as a newer model.
I haven't read anything about the kits, so hopefully someone else can say something about those...
IMPORTANT: You should be skeptical when reading the reports and viewing infommercials that are by the company itself. Often, the tests are done under "ideal" circumstances that cannot be replicated in the real world. Your best bet is to find someone that has actually purchased the product and can give you their personal experience.
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