Brad NSW Posted February 20, 2018 Report Share Posted February 20, 2018 Are there any unintended side effects from lowering the exhaust stack by 2 feet? I'm hoping to take the high fairing off my truck and lower the stack to decrease my overall height. Anyone had any experience using the flexible exhaust stack to splice the cut I'll have to make? I plan on using stainless for the high exhaust temps. Any advice or feedback appreciated. 2010 Freightliner, DD15 Eaton Ultrashift, 2015 New Horizons 5th Wheel. Occupants - Dena/Brad/Hershey BLOG LINK Link to comment Share on other sites More sharing options...
Wrknrvr Posted February 20, 2018 Report Share Posted February 20, 2018 I have cut my muffler off at the top and removed about a foot or so of the large outside of the muffler. That way I still used the original mounting brackets. In this picture you can see the top of the stack turned out to the side to accommodate my jeep to fit up the ramps. The exhaust pipe is on the right side at the top of the photo. Just below it is the exhaust for the generator. I used the original top pipe , turned it upside down and used the angle to get out to the side behind the flaring. Then cut at proper angle. Safe Travels,. Vern Link to comment Share on other sites More sharing options...
Moresmoke Posted February 20, 2018 Report Share Posted February 20, 2018 You didn't say what truck you have, but some of them have a splice in the pipe about the height a flat top sleeper would be. My Volvo does, I just pulled the top stack out, cut off 18" and reinstalled. If you need to cut and splice the pipe, you can use a band clamp to make a butt splice. There are two types of band clamp, one is preformed to clamp a lap splice, the other is flat. With a flat clamp, just butt the two pipes together, and clamp them. Link to comment Share on other sites More sharing options...
rickeieio Posted February 20, 2018 Report Share Posted February 20, 2018 32 minutes ago, Wrknrvr said: I have cut my muffler off at the top and removed about a foot or so of the large outside of the muffler. That way I still used the original mounting brackets. In this picture you can see the top of the stack turned out to the side to accommodate my jeep to fit up the ramps. The exhaust pipe is on the right side at the top of the photo. Just below it is the exhaust for the generator. I used the original top pipe , turned it upside down and used the angle to get out to the side behind the flaring. Then cut at proper angle. Safe Travels,. Vern So you figured out how to post pictures. KW T-680, POPEMOBILE Newmar X-Aire, VATICAN Lots of old motorcycles, Moto Guzzi Griso and Spyder F3 currently in the front row Young enough to play in the dirt as a retired farmer. contact me at rickeieio1@comcast.net Link to comment Share on other sites More sharing options...
DesertMiner Posted February 20, 2018 Report Share Posted February 20, 2018 Why use flexible? Just figure out what size you need and buy a nice and shiney new SS piece! Link to comment Share on other sites More sharing options...
Brad NSW Posted February 20, 2018 Author Report Share Posted February 20, 2018 Thanks for the quick replies and cool pictures/ideas. I'll start disassembling the supports, cut a section out, and do a butt splice. Then use a flat clamp (gotta love Amazon). There are lots of support clamps so it should be real easy. Just got the truck so spending lots of $s on deck and other goodies. Will hold off on the new stainless till the dust settles! Thanks all...seems as simple as I thought. Just wanted to make sure the engine/computer wouldn't notice anything different and cause problems. 2010 Freightliner, DD15 Eaton Ultrashift, 2015 New Horizons 5th Wheel. Occupants - Dena/Brad/Hershey BLOG LINK Link to comment Share on other sites More sharing options...
DesertMiner Posted February 20, 2018 Report Share Posted February 20, 2018 What about the new height blowing all of that good 'ole exhaust all over your clean 5er? Link to comment Share on other sites More sharing options...
Alie&Jim's Carrilite Posted February 20, 2018 Report Share Posted February 20, 2018 Brad NSW has a 2010 Freightliner according to his sig. Soot is a non-issue with the weights he'll be pulling. Alie & Jim + 8 paws 2017 DRV Memphis BART- 1998 Volvo 610 Lil'ole 6cyl Cummins Link to comment Share on other sites More sharing options...
Brad NSW Posted February 21, 2018 Author Report Share Posted February 21, 2018 Only plan on lowering it about 2 feet. It's not singled so it'll have some distance to dissipate if I blow much soot, which I hope isn't the case, the 5er is only 14,000lbs and I do like to keep it clean! 2010 Freightliner, DD15 Eaton Ultrashift, 2015 New Horizons 5th Wheel. Occupants - Dena/Brad/Hershey BLOG LINK Link to comment Share on other sites More sharing options...
Scrap Posted February 21, 2018 Report Share Posted February 21, 2018 Does the lower of the two pipes have the swelled end on it? I don't know Freightliner but usually that mid pipe has the swell and the chrome tailpipe is straight. If so, pull the tailpipe out, chop 2ft off the bottom end of it, put it back in with a new stepped clamp (or whatever they use) and should be good. This is the heat shield NotEven was talking about. Things can be 2" away from this, BUT wood isn't really in the calculation so I don't really know. https://www.petetruckparts.com/product/shield-heat5-inch-14-01661/ Link to comment Share on other sites More sharing options...
Brad NSW Posted February 22, 2018 Author Report Share Posted February 22, 2018 This product looks promising too. https://www.amazon.com/Big-Ant-Motorcycle-Fiberglass-Stainless/dp/B01N0SUX52/ref=sr_1_23_sspa?s=automotive&ie=UTF8&qid=1519271497&sr=1-23-spons&keywords=5"+exhaust+heat+shield&psc=1 Maybe wrap the pipe AND mount a metal heat shield NotEven and Scrap recommended. Both are pretty cheap so not a big investment for peace of mind...or maybe I'm overthinking what a hot exhaust pipe will do to a wood deck 2 inches away. 2010 Freightliner, DD15 Eaton Ultrashift, 2015 New Horizons 5th Wheel. Occupants - Dena/Brad/Hershey BLOG LINK Link to comment Share on other sites More sharing options...
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