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In this video I discuss which part of the exhaust on the KTM 390 Adventure and the KTM 390 Duke is the resonator. I discuss what the resonator does in the exhaust system and why I decided to remove mine in favor of a straight through mid-pipe. The resonator is a huge chamber attached to the exhaust commonly mistaken for the catalytic converter. It is not, but it is huge, heavy and generates a lot of heat next to the rear shock. See why I removed and how to replace it.