4in straight pipe, 5in straight pipe, or stack? - Dodge Cummins Diesel Forum
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post #1 of 9 (permalink) Old 04-21-2017, 05:33 AM Thread Starter
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4in straight pipe, 5in straight pipe, or stack?

I have a '97 12 valve and I'm wondering what exhaust setup sounds the best between a 4in straight pipe, 5 in straight pipe, and a stack. I'm leaning more towards the 5in straight pipe at the moment but I've heard the drone is unbearable so I may run a small muffler or glasspack with a 5in.
Let me know what you guys have/ prefer on your 12 valves.

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post #2 of 9 (permalink) Old 04-21-2017, 07:45 AM
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5 inch will have a deeper tone. It will be a little tight fitting a 5 inch downpipe but it can be done. As for drone, you can get a resonator to help deal with it.

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post #3 of 9 (permalink) Old 04-22-2017, 12:52 AM
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My opinion won't help you. I think all straight-piped Cummins sound like fartmobiles. I like a straight-through muffler that tames the annoying sound and lets it rumble and roar.

As for stacks, if you run 'em make sure you paint 'em pink and fly a rainbow flag.


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Last edited by MaxPF; 04-22-2017 at 11:40 PM.
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post #4 of 9 (permalink) Old 04-22-2017, 05:51 AM
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I am with him, the stack will also leave everything covered in soot everytime it rains. Get a 5" kit with a good flow through muffler.

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post #5 of 9 (permalink) Old 04-22-2017, 06:38 PM
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I had a 4" Straight Pipe exhaust with a 7 inch tip first on my old 1998 12 Valve Ram 2500 Quad Cab. It was loud as hell. I actually got pulled over twice by the same Highway Patrol cop in 3 months for my illegal exhaust. 2nd time he even remembered my name. Tickets both times. My second exhaust, I went with a 5 inch Straight Pipe Kit, but added a Donaldson M090535 muffler. It is one of their highest flowing mufflers, and is a straight through design. When your foot isn't in it, the truck was reasonably quiet. When you put your foot in, it still had a nice growl. That's what I would do. You could always try the 5 inch Straight pipe first and the add the M090535 muffler later. That muffler has a 5 inch inlet/outlet. If you add it to a 4 inch system, you'll need reducers. Most 5 inch exhausts come with a 4 inch downpipe anyway. -Glen

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post #6 of 9 (permalink) Old 04-22-2017, 11:24 PM
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Inside the truck sounds different than outside the truck. Those of us outside would rather you had a muffler (so would the enforcement folks). I like 4", my daughter likes 5"...I hate stacks because it ruins the bed for any use

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post #7 of 9 (permalink) Old 04-23-2017, 07:54 PM
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I have a 98 12 valve with a 5" c/w muffler, no tip, and I like the sound of mine. Deep, throaty sound at idle. When you get on the pedal....they know you are comin.
My brother has a common rail with a 5" no muffler and the drone in the cab at speed is deafening.

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post #8 of 9 (permalink) Old Yesterday, 08:48 PM
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I have 4" straight pipe on my 97. I am very happy with it.
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post #9 of 9 (permalink) Old Yesterday, 10:30 PM
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I installed a 4" straight pipe and the down pipe has little to no clearence.

It's not too bad bobtailing but with a trailer or any kind of load in it, it's super loud. I'm looking into getting a muffler at some point

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