Because it is garbage. Its just a resistor that taps into your IAT to trick the ECU into thinking its getting colder air than it is. The computer will adapt around it, and you won't see anything close to the boal numbers they list. Hence why they say "Up to", so they cannot be held accountable.
No, not 18. No not a google add, it was in the add box on the home page. No didn't buy one. That is why I asked. Thanks for the great answers. I think I was able to sort out that it must be junk. Posted via FF Mobile