We sell those pieces of crap, I can't believe people pay $60+ for about 60 cents of metal in a shiny red box. My old manager tried it on his Nissan Xterra for the hell of it and noticed no difference in his mileage. He returned it after about a month of "field testing".

 

the Tornado does work in certain cars- lets not bash a product totally!
but wont work with VTEC or Vortec engines, which have a built in system that delays the 2nd intake valve opening slightly- creating a tornado like vortex in the airflow swirl to better mix the air/fuel for max combustion

on my old beater carb'ed chevy truck - tornado made the differance when pulling trailer uphill and reduced that chevy v8 hesitation off the line
on the maxima it was good for 2mpg
on the TL- it went back to the store after my own field testing~

Removed the resonator box and installed a K&N instead, my cheap CAI