PETERBILT M120634 Muffler

( Part Type: Muffler ), ( Manufacturer Part Number: M120634 )

Review PETERBILT Muffler

The Peterbilt M120634 muffler is a crucial component of the exhaust system in Peterbilt M100 and M101 series trucks, specifically models with a 34-inch exhaust stack. This muffler, manufactured by Meritor Wabco or another reputable supplier, is designed to reduce exhaust noise and improve overall engine performance.

The muffler's construction consists of a series of tubes or chambers that use various methods to dampen the sound waves produced by the engine's exhaust gases. It may feature a honeycomb design, which provides a large surface area for gas flow and sound absorption, or it could employ a series of baffles to redirect and scatter the exhaust gases, further reducing noise levels.

The inlet and outlet connections on the Peterbilt M120634 muffler are typically made of heavy-duty steel, ensuring a secure fit and reliable connection to the exhaust system. These connections may be threaded for easy removal and replacement or may employ a more robust flange design for increased durability.

The exterior of the muffler is often coated in a high-temperature ceramic coating, which not only helps to protect the muffler from the harsh conditions it will encounter but also provides an attractive appearance. This coating can withstand temperatures up to 1,800 degrees Fahrenheit, making it well-suited to the demanding environment of a commercial truck exhaust system.

The Peterbilt M120634 muffler is an essential part of any Peterbilt M100 or M101 series truck, ensuring both optimal engine performance and a quieter operating experience for the driver and those around them. Regular maintenance and timely replacement when necessary are crucial to maintaining the longevity and effectiveness of this important component.

The Peterbilt M120 sixth series is a popular choice for heavy-duty trucks due to its robust design and excellent performance. One of the essential components of a truck's exhaust system is the muffler, which reduces engine noise and improves emissions. Let's discuss the pros and cons of buying a Peterbilt M120634 muffler.

1. Durability: Peterbilt is known for its high-quality parts, and the M120634 muffler is no exception. It is built to withstand the rigors of heavy-duty use and is designed to last for an extended period.

2. Performance: The muffler is designed to provide optimal exhaust flow, ensuring the engine runs efficiently and effectively. It reduces engine noise, making the truck quieter and more comfortable for the driver and passengers.

3. Emissions Compliance: The M120634 muffler meets or exceeds emissions regulations, making it an ideal choice for fleet operators and businesses that require compliance with environmental regulations.

1. Cost: The Peterbilt M120634 muffler is a premium product, and the cost reflects its high-quality design and materials. It may be more expensive than aftermarket alternatives, making it a significant investment for some truck owners.

2. Availability: Due to its popularity and high demand, the Peterbilt M120634 muffler may not be readily available from all dealers or distributors. This could result in longer lead times for replacement or repair.

The Peterbilt M120634 muffler is an excellent choice for heavy-duty truck owners who require a high-performance, durable, and emissions-compliant exhaust component. While it may be more expensive than aftermarket alternatives, its superior design and longevity make it a worthwhile investment for those who demand the best from their trucks.

If you own a Peterbilt M120 sixth series truck and are in need of a new muffler, consider investing in the Peterbilt M120634 muffler. Its superior design, durability, and emissions compliance make it an ideal choice for heavy-duty use. While the cost may be higher than some aftermarket alternatives, the long-term benefits and performance gains make it a worthwhile investment.

part # m120634 price

• $1035.20

specifications mufflermooch:

• for makes: Peterbilt
• part type: Muffler
• manufacturer part number: M120634

seller mufflermooch:

• # reviews: 60253
• rating: 98.9%

shipping mufflermooch:

• service: Standard
• type: Fixed
• class: Standard
• cost: $0.00
• transit: 3-7 Days

returns mufflermooch:

• time: 30 Days
• paid by: Seller
• policy: Returns Accepted

payments mufflermooch:

• credit card: Discover
• wallet: Apple-pay
• other

offer mufflermooch:

• quantity: 1
• options: Ship-to-home
• sold: 0
• best offers: True
• availability: In Stock
• started: December 3, 2025

general mufflermooch:

• condition: New
• Parts Accessories > Commercial Truck Parts > Other Commercial Truck Parts

Peterbilt M120634 Is Similar To:

• Grand Rock M-533 Exhaust Muffler - New Old Stock Peterbilt (21.7% similar) $180.00. (June 20th, 2025)
• National Truck Parts 50514 5 X 9 Inch 60 Galvanized Steel Muffler Peterbilt Kenworth Frieghtliner (23% similar) $159.99–$189.99. (July 22nd, 2025)
• Grand Rock M-465 Truck Muffler 10 Inch - Fits Kenworth Peterbilt Freightliner Oal 51.5 (23.4% similar) $139.99. (September 16th, 2025)