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11-02-2017, 10:54 AM
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#1
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Junior Member
Join Date: Nov 2017
Posts: 18
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Workhorse chassis
Anyone know where I can buy exhaust manifolds for my 2003 workhorse chassis?
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11-02-2017, 10:57 AM
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#2
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Senior Member
Join Date: Nov 2013
Posts: 5,774
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If you need to replace them, I would take a hard look at Banks headers instead. Otherwise, Ultra RV Products may have stock manifolds.
__________________
2015 Tiffin Phaeton 40QBH
2018 Chevrolet Colorado Toad
Roadmaster Tow Setup
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11-02-2017, 11:02 AM
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#3
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Senior Member
Winnebago Owners Club Workhorse Chassis Owner
Join Date: Oct 2015
Posts: 1,718
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I would check with GM.
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Paul J Stough Iowa
2005 Winnebago Voyage 38J
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11-02-2017, 11:05 AM
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#4
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Senior Member
Winnebago Owners Club Workhorse Chassis Owner
Join Date: Aug 2007
Location: Sonoma County, CA
Posts: 6,401
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Ask to have this moved the the Workhorse Chassis forum for more responses.
__________________
Wayne & Roberta
08 Winnebago Destination 39W Gas UFO Workhorse Chassis......It's really weird being the same age as old people. I thought getting old would take much longer.
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11-02-2017, 11:22 AM
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#5
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Moderator Emeritus
Damon Owners Club Workhorse Chassis Owner
Join Date: Mar 2012
Location: Lone Star State
Posts: 19,203
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Quote:
Originally Posted by UFO Pilot
Ask to have this moved the the Workhorse Chassis forum for more responses.
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Moved 
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11-02-2017, 12:25 PM
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#6
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Senior Member
Official iRV2 Sponsor
Join Date: Jun 2008
Location: Centralia, WA
Posts: 1,216
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If you are replacing both sides it will be more cost effective plus an upgrade to add Banks TorqueTube headers. You can get just the headers only part # 49504. We also carry the original stock manifolds if that is what you’d prefer to use.
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11-02-2017, 02:33 PM
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#7
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Senior Member
Join Date: Jun 2016
Location: SW Louisiana
Posts: 8,945
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Is this on a P series or a W series chassis?
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2002 Safari Trek 2830 on P32 Chassis with 8.1L w/ 400 watts solar 420Ah LiFePo4
2017 Jeep Cherokee Overland & 2007 Toyota Yaris TOADs with Even Brake,
Demco Commander tow bar and Blue Ox / Roadmaster base plates
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11-02-2017, 04:50 PM
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#8
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Moderator Emeritus
Damon Owners Club Workhorse Chassis Owner
Join Date: Mar 2012
Location: Lone Star State
Posts: 19,203
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Quote:
Originally Posted by Isaac-1
Is this on a P series or a W series chassis?
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Possibly W22 w/ 8.1L V8 - see:
http://www.irv2.com/forums/f22/motor...ml#post3881415
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11-02-2017, 09:14 PM
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#9
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Senior Member
Monaco Owners Club Workhorse Chassis Owner
Join Date: Aug 2002
Location: Clovis, CA, USA
Posts: 13,138
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I have had my exhaust manifolds replaced and would suggest going with an aftermarket product.
__________________
2004 Monaco La Palma 36DBD, W22, 8.1, 7.1 MPG
2000 LEXUS RX300 FWD 22MPG 4020 LBS
Criticism is easier than Craftsmanship
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11-03-2017, 07:10 AM
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#10
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Senior Member
Join Date: Oct 2015
Location: Brighton, MI
Posts: 775
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Replaced ours with Doug Thorley headers. Just not worth the effort to put on new stock manifolds and possibly end up with the same problem after a short time.
On the W series chassis the Thorley headers are bolt on replacements. No cutting or welding. Banks headers are probably the same.
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Hank & Lynda
2003 Winnebago Adventurer 35U, Workhorse W22
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11-03-2017, 07:35 AM
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#11
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Junior Member
Join Date: Nov 2017
Posts: 18
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Quote:
Originally Posted by Ultra RV Tech
If you are replacing both sides it will be more cost effective plus an upgrade to add Banks TorqueTube headers. You can get just the headers only part # 49504. We also carry the original stock manifolds if that is what you’d prefer to use.
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What's with the $1200 price tag on stock manifolds? Can't the $400 Dorman 8.1 manifolds be made to work?
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11-03-2017, 07:36 AM
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#12
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Junior Member
Join Date: Nov 2017
Posts: 18
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Quote:
Originally Posted by Isaac-1
Is this on a P series or a W series chassis?
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W22
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11-03-2017, 07:37 AM
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#13
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Junior Member
Join Date: Nov 2017
Posts: 18
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Do you have a part number?
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11-03-2017, 07:44 AM
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#14
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Junior Member
Join Date: Nov 2017
Posts: 18
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Quote:
Originally Posted by 70ChevelleSS
Replaced ours with Doug Thorley headers. Just not worth the effort to put on new stock manifolds and possibly end up with the same problem after a short time.
On the W series chassis the Thorley headers are bolt on replacements. No cutting or welding. Banks headers are probably the same.
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Do you have a part number for those Doug's headers?
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