Most orders placed before 2pm Pacific Monday-Friday will ship same day!

853072 - Workhorse 8.1L Performance Mufflers

853072 - Workhorse 8.1L Performance Mufflers


Order Shipment Notice: 

Most orders are shipped within 24 hours from the order date. Orders placed on the weekend or after cutoff on Friday, and orders placed on select holidays are processed on the next business day. Please see our shipping terms for more information.

Part # 853072 - Workhorse 8.1L Performance Mufflers

This is a replacement muffler for the Workhorse mufflers, 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 Banks TorqueTube headers. This will give you the peformance 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

Is IT the same size as the original workhorse 22. 2005 8.1 vortec ( Claude Dubé , 08/08/2023 )
These mufflers are very similar in size, within a couple inches. ( Support )
This muffler listed says it will fit a 2005 workhorse w22 chaises it states that you have to reuse the original flanges does that mean you cut the old ones off and reweld them on the new mufflers? ( Sherman Preble Jr, 05/24/2022 )
That is correct, we find installation to be the cleanest by cutting the old pipe as close to the muffler as possible so that you can just slip the pipe from the new muffler over that and still have a flanged connection. ( Support )
Are these the correct replacement for a 2005 Itasca Suncruiser 37B? And will they be in stock again soon? ( Julie, 10/03/2021 )
Yes, these will fit your RV. We have stock on this part now. ( Support )
Do you expect these back in stock ? ( Jim Riches, 08/29/2021 )
Yes, we are expecting to have these available in Early September. ( Support )
Will this work on my 2004 winnebago Itasca suncruiser 33V 8.1 liter 496 workhorse engine? If so, do I need any more parts? ( Kaiser Ford, 08/11/2021 )
These will fit your RV. Depending on if you weld or clamp, you might want to pick up a few 3" u-clamps from an auto parts store or muffler shop. ( Support )
Will this fit a 2006 Tiffin Allegro Open Road 35 TSA with an 8.1 L Vortec on a workhorse setup ( James S RAYCROFT, 03/19/2021 )
Yes, they should fit unless there has already been modifications made to the exhaust system. ( Support )
01 WH P32 chassis. How loud are these mufflers? This is for my elderly mothers motorhome. ( Scott Hayes, 09/05/2020 )
They are not loud, not much difference than stock. ( Support )
Will these fit a 2005 Winnebago adventurer? What type of shop will typically install these? I assume Midas or Meinkie won’t do the install.
( Joe Gangemi, 05/17/2020 )
Yes these will fit but do require cutting and clamping or welding in place. Most muffler shops wouldn't have an issue doing the install, it just comes down if they have the facilities to accommodate the size of an RV. We do have the OEM mufflers available which would not require any cutting but they are very expensive:  ( Support )
What is required to replace the mufflers on my 2006 w24 chassis listed above. Do you sell the replacement flanges?
( Edward Tredway, 07/18/2019 )
We do not have the flanges for sale on their own. What we do here in our shop is we cut the pipe as close to the body of the muffler as possible so that we can reuse the stub of pipe with the flange. You'll need a couple exhaust gaskets (15027074) and you will probably want to pick up some 3" clamps from the local auto parts store. ( Support )
need two muffler with center in with flanche on each of front and side outlet 3inch rear ( andre lalonde, 03/20/2018 )
Not answered yet.
Is part number 853072 the correct Muffler for my 2006 Georgie Boy Landau and do you also have the tailpipes ( Adele Kelley, 02/28/2018 )

This is an aftermarket muffler that will work for your Workhorse W22. If you want the original equipment mufflers you can find them here: W0006356

Here are links to the tail pipes:

Right Hand Side: W0000214

Left Hand Side: W0000216

( Support )
Would these be right for 2005 Fleetwood terra P32' with workhorse engine 8.1L ( john, 08/01/2017 )
Yes these will work for your exhaust system. ( Support )
These will fit as SS replacement mufflers for our 06 Bounder 35E WH Chevy? We are also looking for SS replacement pipe from the muffler. Any recommendations? ( Rich, 04/27/2017 )

Hi Rich,

Yes these are the closest to factory replacements that we could find. If you need SS pipe after the mufflers you will need to get that custom made from an exhaust shop.

( Support )

what are the measurerments of muffler, and will this direct fit 2008 workhorse ufo with rear 8.1 engine

( bobby, 08/19/2015 )


Overall length is 28" and body length is 22". We have fit them on UFO chassis's without issue, you will just need to cut the factory pipes as close to the muffler as possible so you can reuse the flanges.

( Support )

I was wondering if you could tell me what the inlet and outlet size is?

( justin, 05/09/2015 )

Hi Justin,

The inlet and outlet size is both 3". 

( Support )

Ask a question

Note: HTML is not translated!

Write a review

Please login or register to review

 The state of California requires that this warning be posted for people purchasing products that reside in California.

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

Shipping Insurance Notice

NOTICE: For orders outside of United States

If you are placing an order to ship outside the United States, Shipping Insurance will be required and added automatically at checkout.


  • Views: 43828
  • Brand: UltraPower
  • Product Code: 853072
  • Availability: 3
  • $303.75
  • $265.00