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               Originally Posted by 
               WeaveMcQuilt 
                
               
             
              O2 Sensor Mod - For me, this made the biggest bit of difference. Low down, it's just beautiful.
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         +1 If you want to improve low down grunt do this first; it will make a huge difference on a stock bike.
         
        
 Go filters and fuelling device next.
         
        
 A change of exhaust/de-cat will make the least difference to low end power (it will make some, but nothing like the above.)