Optional Y-connecting tube. Round shape. Intended for riders who do not wish to make major exhaust system modifications. TIG welding and stainless steel tube. Detailed Specifications: Maximum power: Stock - 116.1 HP at 13300 RPM / Akrapovic - 119 HP at 13100 RPM / Maximum gain - +4.5 HP at 6000 RPM. Maximum torque: Stock - 49.9 lb-ft. at 11000 RPM / Akrapovic - 50.4 lb-ft. at 11000 RPM / Maximum gain - +3.9 at 6000 RPM. Weight: Stock - 6.1 pounds (2.75 kg) / Akrapovic - 1.2 pounds (0.53 kg) / Maximum gain - -4.9 pounds (-2.2 kg). Static noise level: Stock - N/A / Akrapovic - 104.1 at 6750 RPM / Maximum gain - N/A. Measured with: N/A.