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            | 
               Originally Posted by 
              spyke007  
              could someone explain two things please?
              1-what is closed and open loop
 2-what are the stage 1 stage 2 and stage 3 filters composed of
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         Stage 1 
         
        
http://www.motorcycle-exhausts.co.uk...l#.U7v3i5RdW8A
         
         Stage 2
         
        
http://www.motorcycle-exhausts.co.uk...l#.U7v3tpRdW8A
         
         Stage 3
         
        
http://www.motorcycle-exhausts.co.uk...l#.U7v30ZRdW8A
         
         If you want to use Stage 1 + 2 without fuel mod you will need a stage 1 Restrictor insert.
         
        
http://www.motorcycle-exhausts.co.uk...l#.U7v4ApRdW8A