Experience consistent performance with the Donaldson M120749 muffler—a reliable pick for those who demand true quality. Built to meet original equipment standards, this high-performance muffler offers enhanced exhaust flow and superior noise reduction. Whether you’re purchasing a Donaldson M120749 muffler for your pre-2007 medium- or heavy-duty truck, you can trust that every detail is designed for top performance and durability.

Technical Details

• Overall Length: 31.69 inches
• Weight: 29.49 lb
• Inlet Diameter: 5.03 inches
• Body Diameter: 11.84 inches
• Optimized flow capacities in low, mid, and high ranges for improved performance
• Efficient back pressure regulation and noise attenuation features

Why Choose the M120749 Muffler?

This round-style muffler is engineered to offer an excellent balance of strength and efficiency. Enjoy improved exhaust flow, effective noise reduction, and adherence to original equipment standards. With its rugged construction and precise dimensions, it’s perfect for upgrading or restoring your truck with genuine Donaldson parts. Benefit from over 35 years of aftermarket innovation, trust, and expertise.

Ready to upgrade your ride? Order now and experience the quality of authentic Donaldson parts. For more genuine parts, visit our Donaldson page.