The Akrapovic RACING and EVOLUTION systems for the Yamaha R1 has a specific configuration of 4-2-1-2, which means: 4x header tubes run into a double collector, which is attached to a single Y-connecting tube, from which the dual mufflers are led under the seat. For the RACING system the header tubes are conical and made of stainless steel, the collectors are cylindrical and made of stainless steel, the Y-connecting tube is conical stainless steel, both link pipes are cylindrical titanium welded to the mufflers. The rest of the connections are free-floating joints held together with silicon-shielded tensioning springs. The mufflers are available with either titanium or carbon-fiber outer sleeves. The tubes for the EVOLUTION system are all made entirely of titanium. The mufflers for the EVOLUTION are available in the same options as the RACING. All metal elements on the interior of the mufflers are entirely of titanium. The systems have a fitting on the Y-connecting tube for installing a lambda sensor. With Akrapovic RACING or EVOLUTION exhaust systems installed, the motorcycle's exhaust system will no longer contain a catalytic converter or EXUP valve.
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