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853072 - Workhorse 8.1L Performance Muffler

853072 - Workhorse 8.1L Performance Muffler


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Part # 853072 - Workhorse 8.1L Performance Muffler

This is a replacement muffler for the Workhorse W-Series muffler, minus the factory flanges and hangers which should be reused. These mufflers also flow much more than the factory mufflers so you will want to install them as a set. These mufflers have proven to increase performance and extract exhaust heat from the engine. These gains are also achieved while still retaining the factory mellow sound. We have seen on average a 10-15 horsepower increase with these mufflers installed when tested on the chassis dyno.

A popular choice for most customers is to install these mufflers along with a set of LongTube headers. This will give you the performance that the headers provide and still leave you with true dual exhaust all the way back, without leaving the restrictive factory mufflers in place. With this combination we see about 30 horsepower and 40 ft. lbs. torque increase. 


  • Workhorse Motor Home Chassis from 2001-2010

Technical Details:

Outlet Diameter (in)3"Outlet PositionOffset
Overall Length (in)28"Outlet Connection TypePipe Connection
Muffler TypeReflectionMuffler Series RV Big Block
Mount TypeUses New Hangers (Not Included)MaterialStainless Steel
Inlet PositionCenterInlet Diameter (in)3"
Inlet Connection TypePipe ConnectionFitmentUniversal
ColorGrayBody Width (in)10"
Body Length (in)22"Body Diameter (in)5"
Automotive Item GradeHigh PerformanceBody Height (in)5"
Sound LevelMild SoundShapeOval


  • Gains of 10-15 HP and 15-20 lb-ft TQ
  • Downshifts less approaching hills

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WARNING: Products may contain one or more chemicals known in the State of California to cause cancer and/or birth defects or other reproductive harm. For more information, visit www.P65Warnings.ca.gov

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  • Product Code: 853072
  • Availability: In Stock
  • $303.75
  • $295.00