Design and construction of a muffler shows how to cut noise without sacrificing power, using practical theory and test results. This work presents a theory for muffler design and shows how it applies to cross-baffled silencers. The focus is on balancing quiet operation with engine performance, using a high-speed motorcycle engine as the test case. Readers will see how to estimate engine pressures, determine the necessary muffler volume, and arrange compartments and baffles to control gas flow. - Learn the basic ideas behind mufflers and why volume expansion matters. - See how to calculate the muffler size from engine data and desired pressure. - Understand how different baffle designs and orifice areas affect silencing and back pressure. - Review how tests measure noise reduction and engine load impact. Ideal for readers of engineering and automotive topics, including hobbyists and students seeking a practical approach to muffler design.