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               Originally Posted by 
              JuTube  
              Tnx for responding. Maybe I will remove stage 2 filter and after I get O2 and fuel mod put it back on xt. 
                Now I'm waiting KEV to answer me on PM 
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         There is another option, you can install the stage 2 with the DNA restrictor, this effectively makes the bike DNA Stage 1.5 which is made for stock fueling.
         
        
 I had the same questions and was explained here. Been riding my bike with the restrictor for about 2 years:
         
         
        
http://www.xt660.com/showpost.php?p=222320&postcount=11
         
         I am installing the mods soon and removing the restrictor.