How is the sound of the Hero Hastur 620 and can we put extra vibrational sound silencer…..like R1 and Hayabusa?How is the sound of the Hero Hastur 620 and can we put extra vibrational sound silencer…..like R1 and Hayabusa?0 kiran.s - 0 Rep. September 7, 2015 – kiran.s - asked September 7, 2015 Please Login or Sign up.Connect with: Facebook Google ×Login Username or Email Address Password Remember Me Follow 0Question statsActiveSeptember 11, 2015Views2541 timesAnswers1 answerFollowers0 followers