For the CBR 1000RR, launched in the domestic market in April 2004, we achieved a level of noise reduction that is below the third noise regulation standards by using the following noise reduction technologies.

The variable exhaust system that controls the diameter of the exhaust pipe according to driving condition is placed on the exhaust pipe manifold. This system improved output characteristics and achieved an excellent level of quietness as a result of the exhaust noise reduction.

By installing a variable intake system to control the intake opening at the front part of the duct, we improved output characteristics while significantly reducing intake noise.

By placing sound insulating materials (the materials were changed as part of measures to reduce harmful substances contained in very small amounts, which also led to 40% reduction in weight and a higher insulation rate) inside the cowl, the quietness was further improved.

The tire’s internal structure (reinforcement materials and rigidity control) was changed to provide more comfort, gripping power, and reduced weight while ensuring significant noise reduction.