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Author Topic: Straight pipe the Duramax??  (Read 3169 times)
erok131
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« on: October 27, 2011, 07:49:43 AM »

Ok so i just bought me a 01 duramax a couple days ago and im wanting some more sound out of it. everything is stock except for a bullydog programmer. A couple people has told me to just straight pipe it but not sure if thats a good idea. iv never heard one with straight pipes. i do want it loud but i want it to sound good too. anyone got any suggestions.
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Verona Customs

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« Reply #1 on: October 27, 2011, 08:10:53 AM »

I have put in a few straight pipes on these trucks and it didn,t change the sound that much,if you want it louder you need an exhaust system,just my .02.
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xjkrawler
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« Reply #2 on: October 27, 2011, 08:44:30 AM »

You need a Turbo back with larger pipes.
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erok131
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« Reply #3 on: October 27, 2011, 11:23:22 AM »

ok thanks guys
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kmcminn
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« Reply #4 on: October 27, 2011, 11:37:31 AM »

I had a 05 with one and it was pretty loud.
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erok131
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« Reply #5 on: October 27, 2011, 11:51:33 AM »

I had a 05 with one and it was pretty loud.

did it still sound good tho.  i just dont want to straight pipe it and it end up sounding like crap
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doctordick
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« Reply #6 on: October 27, 2011, 12:51:35 PM »

Don't know a lot about these little guys, but the big guys (Detroit, Cat, Cummins) sound pretty raspy with straight pipes.  Any restriction you can remove downstream of the turbo will help performance somewhat at the cost of being louder.  If it were me, I would do a turbo back system of a larger pipe diameter than stock.  The larger pipe will smooth out the sound and if it's still too loud you can add a resonator to quiet it down a little without restriction and reduce droning.  Many big rigs run 6 to 10 inch straight stacks and are not terribly loud.  Next time you see a big ol' Pete coming down the road with big pipes, pay attention to how it sounds.  In general, the bigger the pipe the deeper the tone of the exhaust. 
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kmcminn
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« Reply #7 on: October 27, 2011, 03:43:21 PM »

did it still sound good tho.  i just dont want to straight pipe it and it end up sounding like crap

I thought it did, maybe a few of the guys that heard it will chime in.
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Draco
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« Reply #8 on: October 27, 2011, 03:57:41 PM »

The neighbor kid has one with strait stacks. I think it sounds pretty good it is loud...It's different for sure. Gotta be loud in the truck....I was mowing the ditch, he came by and nailed it, I about un-assed the mower.  :shit:
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« Reply #9 on: October 27, 2011, 05:25:41 PM »

I have an 03 that I put a turbo back 4" kit on. It had a muffler but you could see all the way threw it so it didn't do much but change the tone. My step brother has an 04 that has a 4" without a muffler and it is not that much louder if any. Neither one is TO loud and both sound really good. That's my own opinion though.
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GUNNIN
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« Reply #10 on: October 27, 2011, 05:31:09 PM »

Oh and the power increase was very noticeable
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b5010
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« Reply #11 on: October 27, 2011, 06:34:13 PM »

I got a 03 dmax straight piped with 5in tip liitle loud but i like it thumb
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98sierra
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« Reply #12 on: October 27, 2011, 06:58:35 PM »

straight pipe sounds mean as fuck.. and i have a 4" flow pro off my 06 comes with clamps and all hardware.. if it fits yours its for sale, and for  a little extra ill throw in a banks monster can
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erok131
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« Reply #13 on: October 27, 2011, 10:32:50 PM »

straight pipe sounds mean as fuck.. and i have a 4" flow pro off my 06 comes with clamps and all hardware.. if it fits yours its for sale, and for  a little extra ill throw in a banks monster can
sounds outta budget lol. tryin to go as cheap as possible.

 thanks for all the help. i want to straight pipe it with a single stack but not sure yet what im goin to do so keep the opinions coming
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wontwork
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« Reply #14 on: October 28, 2011, 03:49:45 PM »

I have a 4" MBRP with their muffler from the downpipe back and I like it bunches.  You can tell its there but its not much louder than stock until you mash it.  I like the way it sounds and would recommend it.  All bolt on.  Took me and one of my students about an hr and half to get my old off and new on.
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Mundy

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« Reply #15 on: October 28, 2011, 06:19:59 PM »

i have a 5" exhaust from the turbo out behind the rear passenger tire,  straight pipe, it sounds pritty good,  especially when u get in the throttle
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s10me
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« Reply #16 on: October 29, 2011, 10:30:15 AM »

I have put together several exhaust systems for customers, and think they all sound good when running 4" from the turbo back and either split them with dual 5" tips or even a single 5". Just make sure they turn out to the side and not straight out the back. just thought i would add my .02
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pheany
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« Reply #17 on: October 31, 2011, 12:45:03 PM »

2002 Chevy 2500 HD Duramax Straight Pipe Rev Walk Around



That may give you an idea, but it is hard to tell you how it will sound as this could be a 4 inch pipe instead of the 3 or 3.5 incher.
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B Gillespie
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« Reply #18 on: October 31, 2011, 04:09:44 PM »

Straight pipe diesels sound like beauflex after a bowl of hormel chili.  :gay: :puke:
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Captn Ron

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« Reply #19 on: November 06, 2011, 10:03:55 PM »

I have a 4" MBRP with their muffler from the downpipe back and I like it bunches.  You can tell its there but its not much louder than stock until you mash it.  I like the way it sounds and would recommend it.  All bolt on.  Took me and one of my students about an hr and half to get my old off and new on.
This is what I have on my 07.  Very satisfied.
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