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               Originally Posted by 
              steven660  
              I've recently put a 2to1 MTC exhaust on my bike and changed the filter to DNA Stage 1.
              
 Question I have is with an 08 XT with exhaust sensor do I need to add a fueling mod or does the sensor work that out for itself?
 
 I had no problems when riding the bike this afternoon and evening, and it all seemed ok.
 
 Very very poppy but I like that so won't be blocking the AIS
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         You be fine leaving things as they are.
         
        
 Obviously performance will improve with an O2 controller/optimizer and fuelling device, but you can quite happily save that for another day...