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BMW S1000R 2021 - 2023 Exhaust Silencer Muffler HP1 + dB killer medium Replacement part Beta RR 4T 430 2020-2022BMW S1000R 2021 2023 Exhaust Silencer Muffler HP1 + dB killer medium Dominator HP1 slip on silencer built for BMW S1000R (2021 2023). Supplied with a removable dB killer insert. RACE USE ONLY not approved for public road use. Always check local regulations and venue noise limits. Key specs & features Includes removable dB killer insert. Insert diameter reduction: 021 mm to 202 mm. Medium insert option (as listed). Use to fine tune exhaust volume;