Quote:
         
 
          
          
            
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               Originally Posted by 
              shards  
              +DNA stage 2 filter only, standard main filter = 3.1HP. (Best gain in HP & torque for your money.)
              
 Kev,
 
 Please excuse my ignorance - what does this mean? There is only ONE Air Filter on the XT660, isn't there?
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         The bike comes standard with one main filter in the air box. 
         
        
 We fit a second filter which is called a stage 2 filter, this filter replaces the air box side cover, the air box cover is permanently removed & the stage 2 filter takes it's place. With the extra air that the stage 2 filter offers we can get a 3.1HP gain in power.
         
         
        
Stage 2 filter
         
        http://www.dnafilters.com/filterdeta...p?filterid=258
         
         
        Stage 1 filter.
         
        
http://www.dnafilters.com/filterdeta...p?filterid=643
         
         The nice stainless steel cover can be bought from Worry Brother by PM or from the forums shop on the main page. 
        
http://www.xt660.com/site/node/194 .
         
        
 The stage 2 DNA filter can be fitted with or without the stainless steel cover, the stainless cover is just bling.
         
         
         
        
