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I have a 2019 can am outlander 1000 and I recently installed the single slip on rjwc exhaust with a fuel controller from rjwc and I’m still running lean has anyone had this problem or could you give me what numbers you run for wash color ?
 

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Most of the time a backfire is caused from an air leak in the exhaust system, I'm aware the 19s run lean and if you added free flowing exhaust that can make the lean condition worse but i would recheck where you mounted your new slip on to the head pipe first.
 
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