5.9L Rotary Performance Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with Rotary Injection Pumps Related To Performance And Longevity

4" downpipe on stock turbo? 5" for the rest?

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Old Jun 11, 2011 | 12:27 AM
  #11  
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I did 5" out of the turbo....


Reduced it down to 4" to shoe horn it ...



Then a couple 90 degree mandrel bent pieces...



And BAM it dropped right out in 4" in the original place it was supposed to be.

 

Last edited by SNOOT; Jun 11, 2011 at 12:30 AM.
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Old Jun 11, 2011 | 01:11 AM
  #12  
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I went 5" out of the turbo too Then went to 4" Name:  P1030806.jpg
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Old Jun 13, 2011 | 12:23 PM
  #13  
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I really need to get some twins on the 92.....
 
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Old Jun 20, 2011 | 03:52 PM
  #14  
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wow... is all i can say to those twins. both your designs look super clean. but about the exhaust, i bought the 3-4" flange from source and built the rest myself, 4" dp to 5" after the t case to 5" flex to the stack kit i made myself. i went with five inch because one, it sounds amazing, and two, i just stop by the local semi-truck shop to get all the 5" stuff cheaper than anywhere else, including ebay.
 
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Old Jun 20, 2011 | 04:23 PM
  #15  
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Nothing sounds quite as good as a first gen with 5" exhaust. I went with 5" all the way for a few reasons. 1. It sounds freakin' sweet. 2. The outlet on my primary is 5". 3. My truck is a 2wd, so it wasn't as hard to make it fit.

My downpipe vs. a stans 4"

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A little paint and header wrap for good measure.

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Old Jun 21, 2011 | 01:55 PM
  #16  
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wow man, that is a beast of a down pipe, i cant wait to get started on mine after i finish the trans. you got any videos or sound clips of that beast? nice work too. looks pro.
 
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Old Jun 21, 2011 | 03:57 PM
  #17  
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Thanks man. All I got right now are some crappy cell phone videos.




 
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Old Jun 22, 2011 | 08:57 PM
  #18  
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not bad vids, i love watching the boost gauge go all the way around. you need a got boost sticker
 
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Old Jun 23, 2011 | 01:21 AM
  #19  
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Diamond Eye has 4" from turbo to tail for only 270. I got it from tvdiesel.com
 
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Old Jun 23, 2011 | 12:59 PM
  #20  
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Diamond eye is what I am running 4" from the turbo back it runs and sounds great , Got it from BBD Performance hit them up for a good price.
 
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