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               Originally Posted by 
               tripletom 
                
               
             
               The plastic side panel I can't see being hideously expensive, and the DNA stage 2 filters for the X and R's is basically a sidepanel with a filter in to allow more air in, so it wouldn't be too hard to make a sidepanel with some filter in to give more air surely?
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         I guess it depends on where you ride, but doing this would lower your wading depth, and I think I'd be concerned with water ingress in heavy rain, it does stream acrosss the side panel - when it's biblical, like it usually is up here!
         
        
 I did it to my TTR, gave loads more response, but I lost too much depth in water, so I replaced it with the stock one.