Q4 Hex Slip-On Muffler. With the Q4 you don't need to hear the power, just feel the power! KTM XCF-W 350 2020-2022. KTM XCF-W 450 2023-2023. KTM XCF-W 500 2020-2022. Husqvarna FE 501 S 2020-2022. Husqvarna FE 501 2020-2023.
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