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robert.bavolacc, the HD Slip On's sound great. They really aren't any or much louder than stock but they are deeper. I can actually hear them while riding. From what I have found out you don't need to do the ECM calibration with just the HD Slip On's. I don't know how they sound compared to the SE II's. I think since the SE II's are a higher performance muffler you will need to do the ECM calibration and should probably add the Stage 1 A/C kit too.
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