ZZR250 running in each gear at 100km/h

Please turn the sound volume down. I try to run at "100km/h". (as possible...) Clattering sound is continually made by the clump section. Camera:GoPro HD HERO Muffler:ASAHINA Racing EXTEC WANGUN Z http://www.asahina-racing.co.jp/index... but the engine sound is too noisy :( Japanese version ⇒ (http://www.nicovideo.jp/watch/sm21115192) Referential movie:Ride on Ninja250R (by another person) http://www.nicovideo.jp/watch/sm21074717