I have stage 2 on the Chieftain. Fuel Moto couldn't sort out the backfire with their PV3 tune, so I have it set to the Stage 2 flash. I had plans of getting it on the dyno, but now I have the Challenger coming in next weekI bought my bike with the Stage 1 installed and put the Rineharts on at just over 300 miles. No noticeable popping. I think I've heard it a few times but not near my previous bike.
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