Stitch117 Posted January 8, 2020 Share Posted January 8, 2020 (edited) I have a 1991 Mach CH613 with 48" flat top sleeper, I would like to mount the exhaust mid cap and go from one to dual stacks, is this possible and can anyone point me in the direction of mounting kits? From this pic one to this pic two and three. Edited January 8, 2020 by Stitch117 Quote Link to comment https://www.bigmacktrucks.com/topic/60462-91-mack-ch613-exhaust/ Share on other sites More sharing options...
alex g Posted January 8, 2020 Share Posted January 8, 2020 Not sure if there available thru Mack. You may want to try a truck wrecker if you have any nearby 1 Quote Link to comment https://www.bigmacktrucks.com/topic/60462-91-mack-ch613-exhaust/#findComment-439831 Share on other sites More sharing options...
Stitch117 Posted January 8, 2020 Author Share Posted January 8, 2020 Thank you, not sure of any truck yards in this area, but I will keep my eyes open. Any other ideas greatly appreciated! Quote Link to comment https://www.bigmacktrucks.com/topic/60462-91-mack-ch613-exhaust/#findComment-439836 Share on other sites More sharing options...
880joe Posted January 9, 2020 Share Posted January 9, 2020 You could find you a Rawhide and get a vin# and order the brackets from mack or just make your own. The brackets from mack are not cheap. Also if you do this you better make sure you reinforce the cab good where they fasten to the cab or you will have problems with them breaking the cab out. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/60462-91-mack-ch613-exhaust/#findComment-439867 Share on other sites More sharing options...
Stitch117 Posted January 9, 2020 Author Share Posted January 9, 2020 Thanks for the advice Joe! Quote Link to comment https://www.bigmacktrucks.com/topic/60462-91-mack-ch613-exhaust/#findComment-439880 Share on other sites More sharing options...
david wild Posted January 9, 2020 Share Posted January 9, 2020 I had drivers tell me that dual exhaust made trucks go faster ??????? same bunch that never finished high school but know it all, when I run into those kind now I tell them buy a bunch of trucks and show us how it is done, seems they are always in a company truck ???? easy to be smart when using someone's money other than your own. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/60462-91-mack-ch613-exhaust/#findComment-439884 Share on other sites More sharing options...
Stitch117 Posted January 9, 2020 Author Share Posted January 9, 2020 Don't know much about that, I like the look, its my own money and thus far I have been very successful. Quote Link to comment https://www.bigmacktrucks.com/topic/60462-91-mack-ch613-exhaust/#findComment-439885 Share on other sites More sharing options...
Rob Posted January 9, 2020 Share Posted January 9, 2020 It's not hard to do but I would not mount to the cab, nor bunk. Strictly mount to your risers. Donaldson makes a nice exhaust splitter to fashion dual exhaust and if you have a tube bender around your area they can fashion the offsets you would need. In years gone past I've built several but had a buddy whom worked a bending shop in Peoria so was inexpensive to do, (for me) at the time. 2 Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/60462-91-mack-ch613-exhaust/#findComment-439889 Share on other sites More sharing options...
880joe Posted January 10, 2020 Share Posted January 10, 2020 The factory rawhide exhaust mounts to the cab I don't think there would be any other way to mount them. I had a Rawhide with a million miles on it and the cab where the exhaust brackets bolted on was not broken out. I built a set brackets similar to the original design and put on a 99 CH reinforced the cab some but apparently not enough because they broke the cab out in about 6 months. Not sure how mack reinforced the cab to keep that from happening and couldn't find anyone that could tell me how they did it. Quote Link to comment https://www.bigmacktrucks.com/topic/60462-91-mack-ch613-exhaust/#findComment-439941 Share on other sites More sharing options...
storkmack Posted January 10, 2020 Share Posted January 10, 2020 Our Granites all have cab mounted exhaust and have a pile of miles. None of them have broken out. Quote Link to comment https://www.bigmacktrucks.com/topic/60462-91-mack-ch613-exhaust/#findComment-439964 Share on other sites More sharing options...
880joe Posted January 10, 2020 Share Posted January 10, 2020 I would sure like to know what they did to reinforced the inside of cab to keep them from breaking. I called 3 or 4 mack dealers and body shops and no one had any clue Quote Link to comment https://www.bigmacktrucks.com/topic/60462-91-mack-ch613-exhaust/#findComment-439976 Share on other sites More sharing options...
Rob Posted January 10, 2020 Share Posted January 10, 2020 15 minutes ago, 880joe said: I would sure like to know what they did to reinforced the inside of cab to keep them from breaking. I called 3 or 4 mack dealers and body shops and no one had any clue I'm surprised at that. There is a large reinforcing plate on some cabs that is internal and behind the trim cards that spreads the pull over the back of the structure. I've seen some cabs with it, some without, and never knew why. I don't like cab mounted exhaust from the R model days of fixing them. As all know they were steel cabs and stronger in that application when new than aluminum or fiberglass to mount to. Seen a bunch of them busted out, (vocational trucks) over the years so kinda adopted the bracing that the later models used with vertical risers which can be made very stout. I've never worked on a Granite so cannot answer for their construction at all. In fact limited CH series came through the shop and that's been a long time ago now. Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/60462-91-mack-ch613-exhaust/#findComment-439977 Share on other sites More sharing options...
Stitch117 Posted January 10, 2020 Author Share Posted January 10, 2020 1 hour ago, Rob said: I'm surprised at that. There is a large reinforcing plate on some cabs that is internal and behind the trim cards that spreads the pull over the back of the structure. I've seen some cabs with it, some without, and never knew why. I don't like cab mounted exhaust from the R model days of fixing them. As all know they were steel cabs and stronger in that application when new than aluminum or fiberglass to mount to. Seen a bunch of them busted out, (vocational trucks) over the years so kinda adopted the bracing that the later models used with vertical risers which can be made very stout. I've never worked on a Granite so cannot answer for their construction at all. In fact limited CH series came through the shop and that's been a long time ago now. Rob do you have any pictures of the risers that you used for mounting beside the cab? Quote Link to comment https://www.bigmacktrucks.com/topic/60462-91-mack-ch613-exhaust/#findComment-439997 Share on other sites More sharing options...
Rob Posted January 10, 2020 Share Posted January 10, 2020 5 hours ago, Stitch117 said: Rob do you have any pictures of the risers that you used for mounting beside the cab? I know I did but can't say for certain now. I'll go back through some photos later today. Basically if you look online these were duplicates of what I had seen on factory installs with the two offset bend risers and either a stiffener tube down low running at an angle, or an "X" bracing between the two risers. I'm thinking there was an 8.25" offset to the outside of the truck to clear the sides of the bunk and run guards on the mufflers I favored. Used to get all exhaust products from Jim Hawk as they were Donaldson dealers back then. I don't know about now however. Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/60462-91-mack-ch613-exhaust/#findComment-440014 Share on other sites More sharing options...
Stitch117 Posted January 10, 2020 Author Share Posted January 10, 2020 Just now, Rob said: I know I did but can't say for certain now. I'll go back through some photos later today. Basically if you look online these were duplicates of what I had seen on factory installs with the two offset bend risers and either a stiffener tube down low running at an angle, or an "X" bracing between the two risers. I'm thinking there was an 8.25" offset to the outside of the truck to clear the sides of the bunk and run guards on the mufflers I favored. Used to get all exhaust products from Jim Hawk as they were Donaldson dealers back then. I don't know about now however. Thank you. Quote Link to comment https://www.bigmacktrucks.com/topic/60462-91-mack-ch613-exhaust/#findComment-440015 Share on other sites More sharing options...
Qcman Posted November 26, 2020 Share Posted November 26, 2020 Hey did you ever find the mounts? I’m doing the same on a 1990 ch612 I’m using to pull our fifth Quote Link to comment https://www.bigmacktrucks.com/topic/60462-91-mack-ch613-exhaust/#findComment-464419 Share on other sites More sharing options...
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