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I have a 2012 and am going to be ordering a magnaflow 14" next week and i cant seem to find anywhere what the outlet pipe sizes are i know the inlet is 3" but ive heard 2.25, 2.5 and 3" for the outlets? So if anyone could give me this information that would be great and also does anyone know what the inlet and outlet sizes are for the y pipe as i will most likely be getting a magnaflow one as well.
 

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Here is a site sponsor they've got what you need. But I know that Dodge is diff 3" in and 3" all to way to tail pipe, and a 14" Magna Flow will diff make some noise if thats what your lookin for.. http://www.autoanything.com/truck/dodge/ram-upgrades.aspx/?kc=frmramforumz. I checked here and Y sizes from 2" n to 2" out to 3" n to 3"out. But check this sight out. Also n search, type in Y pipe and in options it will give you the different pipe sizes. Soory I keep editin this post buy I keep findin more info, this link that another member postes on his truck shows the benfit ofa Y pipe. I was amazed at the restriction the stock Y pipe caused. http://www.ramforumz.com/showpost.ph...32&postcount=1
 

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The two tailpipes that meet the muffler on the '12 1500 hemi are 2.25" for sure. Not sure on the y-pipe issue.
 

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My guess is its probably 3", looks to b the same on most all ramz. The difference comes after the muffler, I was corrected on my thinking the it was 3" all the way, but it smaller after muffler.
 
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