Wibowo, Herdianto Tri, and Ali Akbar Akbar. “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 (July 28, 2023). Accessed June 30, 2025. https://pels.umsida.ac.id/index.php/PELS/article/view/1423.