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KTM 990 SUPER Duke 2005 - 2013 Exhaust Silencer Muffler GP1 + dB killer medium Full exhausts system Beta RR 4T 390 RacingKTM 990 SUPER Duke 2005 2013 Exhaust Silencer Muffler GP1 + dB killer medium Dominator GP1 slip on silencer built for KTM 990 SUPER Duke (2005 2013). 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: 005 mm to 201 mm. Medium insert option (as listed). Use to fine tune