“The Effect Of The Addition Of Db Killer On The Noise Of Yamaha Vixion 150cc Racing Motorcycle: Pengaruh Penambahan Db Killer Pada Knalpot Racing Motor Yamaha Vixion 150cc Terhadap Kebisingan”. Procedia of Engineering and Life Science, vol. 4, July 2023, https://doi.org/10.21070/pels.v4i0.1396.