M. K. . Hamid, S. M. Rosman, and N. Muslim, “Optimization of Backpressure in Exhaust Muffler for Automobile”, jamea, vol. 2, no. 2, pp. 23–30, Dec. 2021, Accessed: Aug. 13, 2026. [Online]. Available: https://journal.uthm.edu.my/index.php/jamea/article/view/9203