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7.3L IDI Diesels (Not Power Strokes) Technical discussion of topics related to vehicles powered by the 7.3 Liter In-Direct Injection Navistar engines.

       
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Old 02-26-2006, 07:47 PM   #1 (permalink)
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diameter of exhaust

Does the diameter of the exhaust make any difference how load the truck is? For example I am the proud owner of an newly installed turbo and want to try running with out the muffler. would the truck be quieter with 4" pipes rather than 3"? I would thinkthat the 3 inch pipes would be louder.
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Old 02-26-2006, 09:01 PM   #2 (permalink)
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Re: diameter of exhaust

I dont think the difference will be noticeable. What would make it louder or quiter is different configurations and routes...
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Old 02-26-2006, 09:40 PM   #3 (permalink)
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Re: diameter of exhaust

The bigger the pipe, the lower the tone will be. With a smaller diamater pipe the tone is a little higher pitch, and can be raspy. I have had 3.5" straight pipe and really liked the way it sounded, and changed it to 4" all the way back from the Down Pipe, and it sounds even better. It is not too loud.

If you can go with the 4" than do it. You can always cut in a straight through muffler if you want ot at a later date, but you wont want to!
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Old 02-26-2006, 11:48 PM   #4 (permalink)
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Re: diameter of exhaust

I will probably do just that. I can make the exhaust so that a muffler can be bolted in when I will be pulling the travel trailer. I lik eit loud but after 4 or 5 hours of pulling it may get to be a bit much.
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Old 02-27-2006, 12:18 AM   #5 (permalink)
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Re: diameter of exhaust

[ QUOTE ]
I will probably do just that. I can make the exhaust so that a muffler can be bolted in when I will be pulling the travel trailer. I lik eit loud but after 4 or 5 hours of pulling it may get to be a bit much.

[/ QUOTE ]

Right now and since I installed my turbo, I'm running a 3" straight back. Around town it's not too loud, but I can tell you that when pullin a 10k 5er up a mtn I kept waiting for the rock slide from the LOUD FRIGGIN' NOISE comin' from the tail pipe [img]/ubbthreads/images/graemlins/eek.gif[/img]. I've just scored a free, almost new, 4" pipe with stock muffler that I'm gonna have put under there when I get paid next. OkieGringo
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Old 02-27-2006, 10:57 AM   #6 (permalink)
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Re: diameter of exhaust

I am pretty sure it will be too loud for me when pulling the trailer but it must sound very nice when empty running around town. I have heard a few cummins running around without mufflers and they sound nice. Does the 7.3 sound similar?
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Old 02-27-2006, 12:04 PM   #7 (permalink)
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Re: diameter of exhaust

well why we are on this subject, my muffler is shot and i was wondering do we need a certian muffler or can we use a glass pack i have 2 new glass packs laying here.
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Old 02-27-2006, 12:35 PM   #8 (permalink)
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Re: diameter of exhaust

[ QUOTE ]
well why we are on this subject, my muffler is shot and i was wondering do we need a certian muffler or can we use a glass pack i have 2 new glass packs laying here.

[/ QUOTE ]

Glass paks might be too restrictive. A diesel muffler is mighty big, might be a reason for that? You'd be better off just straight pipein' it until/if a "nice peace offier" stops ya. Straight pipes sound kinda like a big block with glass paks. OkieGringo
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Old 02-27-2006, 10:50 PM   #9 (permalink)
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Re: diameter of exhaust

well i was just wondering about that? i know i have to have some type of muffler to get it inspected, and my glass packs are stright through 2 1/2 inchers. they are made by thrush,
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Old 02-28-2006, 11:27 AM   #10 (permalink)
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Re: diameter of exhaust

You must be refering to cherry bombs. Long and tube like(he he where have I heard that before) and they are a not restrictive yet but I think the insulation will pack up with soot.
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Old 02-28-2006, 01:25 PM   #11 (permalink)
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Re: diameter of exhaust

I would put the glass packs in and run a dual exhaust, I think you can burn the insulation out with the exhaust or else it will fill up with soot and then you'll be good to go. [img]/ubbthreads/images/graemlins/cool.gif[/img]
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Old 03-01-2006, 02:37 AM   #12 (permalink)
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Re: diameter of exhaust

well i think i will give it a shot any ways LOL i had them on my 4x4 for a couple of months before the guy next door complain aboutthe and i removed them packed them up, but i think i will stick them on the diesel and try it out and see what she sounds like LOL.
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