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This neo-retro exhaust shape utilizes a heritage design first used by Akrapovič 30 years ago, now updated for today’s market with the use of modern technology, state-of-the-art solutions, and innovative materials. 
The complete system is EC/ECE-type approved, with a catalytic converter incorporated into the layout to make it a Euro 5 product. The muffler outer sleeve is constructed from high-grade titanium, with stainless steel for every other component, and the pre-muffler and muffler are sandblasted for a perfect finish. A black-coated muffler bracket and two heat shields, designed to protect the riding gear, are included in the package. 
The muffler exits on right side of the bike (standard is underneath), emphasizing the racing and retro look of the machine. The system delivers a deep, full, and vivid sound allied to a perfect throttle response, and it adds 1.4 kW (1.9 hp) of power at 9,100 rpm and increases torque by 1.4 Nm at 9,800 rpm when measured on the Akrapovič dyno against a Yamaha XSR900 with a standard stock exhaust system. It has plug-and-play installation, with no remapping needed.