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               Originally Posted by 
              Kev  
              When I ported my XT660 head I removed all the big lips under the seats, flowed & polished the intake & exhaust ports. If you are going to port your motor you will need a custom Power Commander map.
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         Ok, that's the answer I wanted. The problem is that PC + bench mapping costs around 600 Euro in Sweden..
         
        
 Btw, intake ports should not be polished, preferably they should have a rough surface!
         
        
 Thanks for the airbox tips!