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12 Valve 2nd Gen Dodge Cummins 94-98 Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with P7100 Injection Pumps

3 inch or 4 inch straight pipe

   
Old Dec 7, 2011 | 08:10 PM
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12valvecumminspower's Avatar
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Default 3 inch or 4 inch straight pipe
hey guys.. what do u all think sounds better overall. A 3 inch straight pipe or a 4 inch on the 12 valve?
 
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Old Dec 7, 2011 | 09:09 PM
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Im running a 4" strait. I love it sounds great and flows awsome!!
 
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Old Dec 7, 2011 | 09:24 PM
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is it pretty loud?
 
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Old Dec 7, 2011 | 10:50 PM
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4" downpipe, 5" straight no muffler. Gotta let the beast breathe!

But then youre gonna need to get it air...BHAF , maybe an aftermarket intake horn, bigger turbo later down the road
 
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Old Feb 12, 2012 | 03:49 PM
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4 inch magnaflow or mbrp sounds amazing...i run 5 inch MBRP turbo back an love the sound...go stainless exhaust it wont rust out like the other kinds
 
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Old Feb 12, 2012 | 05:31 PM
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Originally Posted by DodgeDually1996
4 inch magnaflow or mbrp sounds amazing...i run 5 inch MBRP turbo back an love the sound...go stainless exhaust it wont rust out like the other kinds
I agree I have the 4" MBRP turbo back and it sounds really good. Really wouldnt want to run 3" though. So to answer your question 4" but 5" is always an option too.
 
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Old Feb 12, 2012 | 05:46 PM
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Yea i put a 4 inch mbrp straight pipe on it and it sounds great!!
 
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Old Feb 13, 2012 | 08:42 AM
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you'll like the 4 inch, less back pressure on the turbo the better
 
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Old Feb 13, 2012 | 03:15 PM
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i got it 4 turbo back to 5 bed kit to 6 stacks and sounds great! so id say do 4 inch back to a bigger tip
 
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Old Feb 14, 2012 | 03:07 PM
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Im gonna go with 4" as well If you want noise run a straight pipe, if you want flow but less noise just run a straight through muffler!
 
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