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The noise properties of the agricultural farm tractor are discussed. The major noise sources are identified, along with a review of why, how, and to what degree these sources should be controlled. Because of their similarity, the information is also applicable to construction machinery equipment. The control of intake and exhaust noise is dealt with from an overall tractor noise standpoint -- tractor noise being more than just exhaust noise. The conventional air cleaner is treated as a silencing device. Experimental data and analytical methods are presented to substantiate that one must be concerned with the entire exhaust or induction system -- not just the muffler or air cleaner -- to get the optimum benefit from the materials and space used while retaining maximum engine and vehicle performance.