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Wibowo, H.T. and Akbar, A.A. 2023. The Effect Of The Addition of Copper DB Killer On Yamaha Vixion 150cc Motorcycle on Exhaust Emissions: Pengaruh Penambahan DB Killer Tembaga Pada Knalpot Racing Motor Yamaha Vixion 150cc Terhadap Emisi Gas Buang. Procedia of Engineering and Life Science. 4, (Jul. 2023). DOI:https://doi.org/10.21070/pels.v4i0.1423.