5.9L CR Performance Discussion of 5.9 Liter Dodge Cummins Diesels with Common Rail Injection Related To Performance And Longevity

Bye bye cat

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  #1  
Old 08-07-2009 | 09:26 PM
ranger1179's Avatar
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From: Dallas TX
Default Bye bye cat

I just finished removing the cat from the truck, replacing it with a piece of pipe. So now it is truly a straight pipe. Sounds great in the garage, now to take it for a test drive.

Has anyone else that has done this, found that it changed EGT temps or changed fuel milage?
 
  #2  
Old 08-07-2009 | 09:54 PM
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From: Gloucester Va.
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the more air out will help out so how did the road test go
 
  #3  
Old 08-07-2009 | 10:09 PM
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From: Billlings, MT
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I just stuck the Cat back in my truck and there wasn't a change in performance.
 
  #4  
Old 08-08-2009 | 10:48 AM
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I took it for a short test drive this morning to breakfast. It sounds a little louder all the time but a lot louder when you get next to something on the tailpipe side. I didn't get on the highway to really check out egts at speed, but they seemed close to the same as before in town. I did notice that it smokes easier than before without really getting on it at all.
 
  #5  
Old 08-08-2009 | 12:18 PM
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From: O'Fallon, MO
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i actually felt like i lost a little power in the pant-o-meter when i took my stock muffler off.. but when i took my cat off i gained like 2-4 mpg didnt really feel like i gained any hp removing the cat...
 
  #6  
Old 08-08-2009 | 06:20 PM
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I did that and went all open for about 2 weeks then I had to muffle it some so I put a Magnaflow on it. I don't know if it helped anything or not b/c I only had the truck for a week before I did it....but I sure do like the way it sounds now
 
  #7  
Old 08-08-2009 | 07:52 PM
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From: lebanon Pa
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mine was "pre straight piped" when i got it, so i don't know how it ran with a cat and muffler, but i really like it without anything on, and it seems to be going strong around 70,000 now and no problems
 
  #8  
Old 08-08-2009 | 09:17 PM
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If you want loud get a 5" Kit with no cat or muffler and a 6" Tip
 
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