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Kawasaki ZR7 / ZR7S 1999 - 2004 Exhaust Silencer Muffler HP1 BLACK + dB killer K-Tech Honda CB 1100 X11 HP1Kawasaki ZR7 ZR7S 1999 2004 Exhaust Silencer Muffler HP1 BLACK + dB killer Dominator HP1 slip on silencer built for Kawasaki ZR7 ZR7S (1999 2004). 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: 999 mm to 200 mm. Use to fine tune exhaust volume; results depend on