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 |