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               Originally Posted by 
              semmyroundel  
              when browsing where to buy these filters (stage 1 and 2) I noticed one supplier saying with the stage 2 that it was necessary to adjust fuel ratio or bike would burn too lean
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         This is correct. You really should adjust the fuelling to suit a stage 2 filter setup. As has already been mentioned, the cheap, quick and easy way is with a Kev mod and the expensive way is with a Power Commander.