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| 2 1/2 or 3 inch straight pipe? http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=5&t=78494 |
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| Author: | LS12FAST4U [ Thu Mar 06, 2014 5:48 pm ] |
| Post subject: | 2 1/2 or 3 inch straight pipe? |
Just wondering if anyone has ever straight piped their CRD? I currently have cut out the muffler and just added a piece of 2 1/2 inch exhaust pipe there but I would like it a little louder and possibly more turbo noise. |
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| Author: | Glend [ Thu Mar 06, 2014 7:18 pm ] |
| Post subject: | Re: 2 1/2 or 3 inch straight pipe? |
There are plenty of past discussion on this topic, just use the search function to find them. Based on laminar flow arguments, a 2 1/2" pipe is the choice for the KJ CRD, any bigger and you actually reduce flow. You can get away with a straight pipe as the turbo serves as a muffler in part. Just make sure you eliminate the various restrictions around flanges and clamps. |
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| Author: | LS12FAST4U [ Mon Mar 10, 2014 10:30 pm ] |
| Post subject: | Re: 2 1/2 or 3 inch straight pipe? |
I was more concerned about sound rather then power. Remember we drive a diesel liberty its not a drag strip car. I don't care if it gains 1 hp or loses 5 I just want it to sound like a diesel truck. |
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| Author: | racertracer [ Mon Mar 10, 2014 10:57 pm ] |
| Post subject: | Re: 2 1/2 or 3 inch straight pipe? |
Going on what past members have experienced when doing the 3" mod instead of the 2 1/2". The 3" didn't increase the diesel sound, it reduced it and it didn't increase any more performance than the 2 1/2" mod. It was a useless modification. |
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| Author: | WWDiesel [ Tue Mar 11, 2014 11:36 am ] |
| Post subject: | Re: 2 1/2 or 3 inch straight pipe? |
Glen, I replaced CAT with 2 1/2 straight pipe eliminating the restriction point just in front of the CAT flange. Put on a Flow Master 2 1/2 in and out muffler. Great sound and helped power a little bit. Sound to me is just right, not too loud, and enough to let you know it is a diesel!!! 
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