I have a comment; send me the $50, it'll have the same effect on your performance. Think about it, the CAFE thiong has got the car companies pullin their freekin hair out trying to get their avg up. Wouldn't you think with the BILLIONS Ford spends trying to get their avg up .5 MPG that they'd have this on if it really did what it claims to ? Swirling air INSIDE your combustion chamber is good, swirling air outside is,,,,a waste of money. BUT if you firmly believe it may work, you may wanna try that 'inline fuel magnet' that supposedly 'aligns' your gas molecules for more power and economy too. As long as ya got $$$ to burn. Plain and simple; 1 part fuel, 15 parts air is what your engine (basically a big air pump) needs. Increase THAT amount, either by easing air in, or out, or both, and you get more HP/Torque. THAT'S IT, all the rest of this CR@P is just that,,,,Ken