thomasp Report post Posted October 20, 2011 Be aware that the Freightliner exhaust diffuser can come loose and fall off. $380 later, we now check that the diffuser has not loosened up before we travel. We have a 2009 Winnebago Journey and learned the hard way that this part is not welded on but is clamped on with two nuts and not covered under warranty or on the checklist of things to watch. Check those nuts! Share this post Link to post Share on other sites
daltonrandj Report post Posted May 20, 2015 Just lost mine on a 2009 Itasca Meridian. Share this post Link to post Share on other sites
ultraglide Report post Posted May 20, 2015 I have a 2014 Journey. Where would I find the diffuser? Share this post Link to post Share on other sites
huffypuff Report post Posted May 20, 2015 Ultraglide, That is the last pipe that exit from the exhaust pipe to keep exhaust from hitting the coach body. Share this post Link to post Share on other sites
hermanmullins Report post Posted May 21, 2015 Chrome Tail Pipe Tip or Extension? Herman Share this post Link to post Share on other sites
desertdeals69 Report post Posted May 21, 2015 They are usually 3 or 4 inch id and cost between $150-$200. Some are straight and some are curved. Share this post Link to post Share on other sites
ultraglide Report post Posted May 21, 2015 Ok thanks will keep an eye on mine. Share this post Link to post Share on other sites
campcop Report post Posted May 21, 2015 My exhaust tip is a piece of stainless steel about 16" long, can't imagine that costing $150 or more I polished it, looks like chrome.. Share this post Link to post Share on other sites
kingfr Report post Posted May 21, 2015 My exhaust tip is a piece of stainless steel about 16" long, can't imagine that costing $150 or more I polished it, looks like chrome.. Believe it. A replacement tip for my 2008 Phaeton was over $300 from Freightliner. They replaced it under warranty because the original diffuser rusted so badly. Had to pay an hour's labor to get it installed. Share this post Link to post Share on other sites
elee Report post Posted December 31, 2016 I changed out my exhaust diffuser on my 2010 Winne Journey Express. It was a rusty ugly. I could not find a direct replacement anywhere, so I ordered a stainless 12" turn down tip. After a few thousand miles, the EGR failed and I got the ole' "check engine light". Maybe there is some relevance to the shape and size of the tip (diffuser) and the new EPA exhaust configuration critical to the regeneration system. ?? Anyone have similar experience? Share this post Link to post Share on other sites
wolfe10 Report post Posted December 31, 2016 Elee, Welcome to the FMCA Forum. While it is unlikely the two are related, it would be a question for either Cummins (with your engine serial number) and/or Freightliner (with your VIN): Cummins 800 343-7357 Freightliner 800 385-4357 Share this post Link to post Share on other sites
dickandlois Report post Posted December 31, 2016 Elee, Welcome to the Forum! Your coach has the 6.7L engine equipped with the DEF system. Personally thinking it is more related to the DEF system then the diffuser if it has the same ID as the OEM part. Do you have the code(s) that set the Check engine light. Rich. Share this post Link to post Share on other sites
wildebill308 Report post Posted December 31, 2016 The only thing that could possibly cause a problem is if there was a sensor in that diffuser that isn't in the aftermarket one. I have never seen one but I would do what Brett said and call and talk to the source. Happy New Year. Bill Share this post Link to post Share on other sites
