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            Do I need it? 
            
             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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             Yamaha XT660X '08' Blue | DNA Stage 1 | MTC 2 into 1 Carbon Oval | OTR Tail Tidy | Engine Painted Black | | 
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 Obviously performance will improve with an O2 controller/optimizer and fuelling device, but you can quite happily save that for another day... | 
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             Cheers Pleiades, theres so many posts on it I couldn't find the info I was looking for.
             Maybe when I change to Stage 2 DNA I might look at it again then. How much is involved with fitting a fuelling device like a PC and does it work inline with the exhaust sensor? 
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             Yamaha XT660X '08' Blue | DNA Stage 1 | MTC 2 into 1 Carbon Oval | OTR Tail Tidy | Engine Painted Black | | 
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              Quote:
              
 The most time consuming/expensive part is the dyno time if you want a custom map. | 
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