Muffler Selection by Style & Engine Exhaust Data
Selecting the Right Muffler for Your Engine NOTE: Depending on your location, some diesel engines require the use of an emissions aftertreatment device to meet emissions regulations. In the United States, federal law prohibits the replacement of an emissions device (i.e., catalytic converter, combined catalytic converter/muffler, diesel particulate filter, etc.) with a non-emissions reducing (such as a straight pipe or conventional muffler) or un-approved emissions device. If operating the vehicle outside of the United States, make sure to check with and comply with any emission regulations for your locale. Step 1 Determine the exhaust flow (CFM) and acceptable exhaust system backpressure of your engine, refer to your owners manual or contact your engine manufacturer for this information. To calculate exhaust flow, see our instructions on page 7. Note: If you are spec’ing a dual muffler system divide engine’s exhaust flow (CFM) by two. Step 2 Find your muffler style (inlet/outlet positions and shape: round or oval) using the illustrations on the left. Proceed to the same style in page 45-51. Step 3 Within the style, choose desired inlet diameter that is at or below your exhaust flow rate AND at or below the acceptable backpressure level.
Style 1 End Inlet/End Outlet/ On Center
Style 2 End Inlet/End Outlet/ Offset
Style 2A Dual End Inlet / End Outlet
Style 3 Side Inlet/End Outlet
Style 4 End Inlet/Side Outlet
Style 5 Inlet & Outlet on Same End
Muffler Size May Affect Backpressure: Mufflers are key to vehicle and equipment performance because as the muffler decreases the sound, it may create more backpressure on exhaust flow. Typically, an increase in backpressure means decreased engine performance. A large muffler can be used to offset increased backpressure while maintaining overall acoustic performance.
Reduced Noise Better Sound Attenuation
Higher
Style 6 Side Inlet / Side Outlet
Backpressure
Lower
Better Fuel Economy More Power
Mufflers for Off-Road Use Many of our mufflers are specifically designed for off-road equipment. These mufflers are shown in blue type on pages 45-51 and have the following features:
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