Yamaha All New R15 VVA Stationary Noise

Difference of Stationary Noise Level with Three Muffler Variation (standard, Modification with dB Killer attached and off) The measurement use the UN ECE Regulation 41, using Bruel & Kjaer 2250 as the main instrument . The data show that the modification of muffler is effecting the noise level, and the dB Killer is reducing it in significant value.