Mufflers

Features

Seven inlet/outlet styles in both aluminized and stainless steel

Many different configurations to fit/adapt to your vehicle/equipment

High temperature paint available on select models

A full offering of accessories to make sure your exhaust system fits and is mounted properly – clamps, hangers, connectors, tubing, tailpipes and all associated components

Benefits

Low back pressure for better fuel economy and efficient engine performance

Corrosion resistant materials for long service life

Mufflers for every budget – with good, better and best alternatives

Applications

On-road trucks

Off-road vehicles and equipment

Muffler Design & Performance

Donaldson mufflers are designed and tested with a specific focus three performance variables.  Be sure to select a system or replacement parts that are right for your application.

• Attenuation
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• Refers to the reduction in sound level measured between an engine without a muffler – and the same engine with a muffler
• Measured in the decibel scale (dBAs)
• Traditional mufflers use tubes, baffles, expansion chambers and insulation to control noise
• New applications include emissions control devices
• Engine manufacturers generally expect engine exhaust sound reductions of 15 - 25 dBA
• The EPA also regulates noise levels
•  
• Backpressure
•  
• Refers to the force necessary to flow gases through the exhaust system, or the resistance to flow
• Excessive backpressure can reduce horsepower and fuel economy
• To promote efficient engine performance, minimization of backpressure is very important
• It's important to minimize system friction and momentum effects – expansion, contraction, elbows and velocity head loss at outlet
• Our muffler specifications offer suggestions for proper selection to reduce backpressure 
•  
• Structural
•  
• Structural durability of systems and components is also very important
• Variables to consider include position, mounting support, weight and material type
• For example, if an OE specifies a particular system, and you install a heavier system (such as an emissions control device), its critical that you upgrade hangers, brackets and stanchions with more robust components that can support the added weight
• Most exhaust system problems seen by our field service techs are due to improper bracketing or use of clamps – rather than issues with muffler construction