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               Originally Posted by 
              Kev  
              The Kev fuel mod has a more precise adjustment through a variable resistor, they use a fixed value through switches. Both connect to the Air Temp sender. Mine has been dyno tested & can show you first hand how it adjusts the Air/Fuel ratio, they do not show any proven results. 
              http://www.youtube.com/watch?v=glkdBO8aZm0&feature=channel    The end result would be similar.
               
                I bet they would not show you the insides of their mod & tell how to make your own if you have the skills. In the end it is up to the buyer, they are running a business trying to make money out of their mods, I am trying to help by offering the cheapest mods possible to riders. 
               
                I built my first Air Temp mod back in 1996 on a Volkswagen 20L 16 valve motor, so I have been making them for a while now.
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         Thanks Kev, I asked the question because I didnt know how the other device worked or what it was connected too. Now I know its connected to the air temp sender its obvious your device is better.
        
 I'll stick with what I've got till I can afford a power commander and custom map.