4 or 5 inch exhaust - Diesel Bombers



5.9L 24V Performance Discussion of 24 Valve 5.9 Liter Dodge Cummins Diesels with VP44 Injection Pumps Related To Performance And Longevity

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Old 04-04-2009, 09:25 AM
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Default 4 or 5 inch exhaust

Im thinking of a custom exhaust. I maybe want something a little different than everyone else. I thought of maybe the exhaust coming out infront of the rear tire. Has anyone done that? Or just the standard out the back. Buts whats louder 4 or 5 inch
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Old 04-04-2009, 10:00 AM
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Lots of guys have run the exhaust infront of the wheel - definitly louder and depending on how much fuel you have, youll have lots of soot on the wheel and the back of the truck.

4" is probably louder and the 5" will give you a deeper sound.
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Old 04-04-2009, 10:04 AM
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Until your hittin the 500hp range the 5 inch is supposed to lose you power so it would be better to stick to the 4 inch till then.
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Old 04-04-2009, 10:26 AM
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Here's the best install I've run across yet. https://www.dieselbombers.com/cummin...r-exhaust.html
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Old 04-04-2009, 01:54 PM
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Ok when i got my truck the previous owner cut the exhaust off behind the muffler. So i took everything off and just bent up some pipe and ran a straight 3 inch out the back. Its not loud enough for me, but what would happen if i cut that and ran it out infront of the rear tire. Whould that be any louder??
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Old 04-04-2009, 02:44 PM
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prolly make it louder for ya, but.... i don't know what color your truck is, or, what you got done to it, but you are likely to make the back of your truck, up the side, pretty black. i have seen it happen to a ford my buddy had. he always had to wash it and keep it clean. was a pain, he only had it on till winter, then got sick of cold hands once a week to wash his truck. but it did sound pretty good, and looked neat.
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Old 04-04-2009, 02:47 PM
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its white but i am going to line-x the bottom of my truck so that would help out a little. juice with attitude, boost elbow, bhaf. I know there will be soot all over but with the line-x and i usually keep it pretty clean anyway, i just want it a little louder
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Old 04-04-2009, 03:36 PM
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5" will give a deeper sound over the 4". The Size of exhaust tip also helps with the sound.



Luke
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Old 04-04-2009, 04:29 PM
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I dont know how much power you lose between the 2 sizes but, I have a 5 inch on my truck and im pushin like 325 to the wheels, its actually probably not enough to be significant would be my guess,it sounds great and it has a muffler, but when youre trying to market something you have to make it sound like you need it till you get here then you need that when you get there. The only thing with 5 inch is the fit, mine hits the crossmember where my transmission mounts, so I have to rehang it. I would go with 5 inch because sooner or later youre going to want more power and to be honest i think 4 inch straight pipe is annoyingly loud. Everyone thinks my truck is loud enough. So I dont want to go with a 4 inch and besides cruisin over 2000 rpms you will develop an annoying drone inside youre cab if its in front of the tire.
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Old 04-04-2009, 04:35 PM
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im not going to lie i want it pretty flippin loud. just wanted to know what was the loudest other than stacks. Some say straight 4 others say straight 5 is the loudest. I just want it annoyingly loud.
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