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Our award winning slip-ons for Harley Baggers are beloved by editors and real-world riders alike. That's because Cobra Slip-ons provide increased horsepower and torque with a deeper, more aggressive exhaust note. The 4-inch muffler body has proprietary technology to prevent bluing. With the perforation located further back in the muffler, it gives the exhaust gases a chance to cool before exiting the silencer core making Cobra Dresser mufflers virtually blue proof. The Race Pro tip is offered with a matte black coating, as well as seven, 12 point PEM;® fasteners for an aircraft grade look.