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Exhaust 5.7 HEMI Exhaust Discussion


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  #1  
Old 06-04-2012, 04:58 PM
GreatBigTuna GreatBigTuna is offline
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Default What type of muffler? 1->1 or 1->2?

Hi Guys,

I recently picked up a 2010 1500 4x4 and in the beginning was infatuated with the sound of it. Now a couple weeks later and the sound starting really grating me as it's almost louder than the 98 cummins I used to drive. (not really, but close)

Anyway I crawled under the truck to see what kind of exhaust was on this truck (cause it's definitely not stock) and I found that the PO had replaced the stock muffler with a piece of 3" pipe and a 3" into 2-1/2" Y pipe, so I'm essentially running straight pipe for the cats. I think they also cut the resonators out.

So my system from front to rear goes:

Manifolds (2) -> Cats (2) -> Y pipe -> Straight 3" Pipe -> Y pipe -> 2.5" Tailpipes -> 5" Chrome tips.

This thing is too loud so I want to put a muffler on it, which leads to my actual question. Should I put on a 1 into 2 muffler, or since the 3"->2.5" Y pipe is already there, just go with a 3" Single In to 3" Single out type of muffler. What would be the advantages/disadvantages of each?

Sorry if this is a stupid question, I just don't know all that much about performance mods, so I want to make sure I'm not doing something that will drastically reduce the performance. Thanks in advance!!!!

-- Jason
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  #2  
Old 06-05-2012, 12:30 AM
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chefred112 chefred112 is offline
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here's an outta the box way of thinkin...2 > 1

http://s1127.photobucket.com/albums/...t=shortrun.mp4


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Old 06-05-2012, 09:50 AM
GreatBigTuna GreatBigTuna is offline
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Ok, I've figured out that what I've got is the Mufflex M80 delete kit. Way too loud. I think I'm going to go with some sort of 24" 1->2 muffler to tame her down.

Unfortunately the M80 was welded on, so It's going to be a PITA to remove

Is there a market for these things used? I'd love to try and recoup some of my cost to replace it. Thanks!
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Old 06-05-2012, 09:56 AM
GreatBigTuna GreatBigTuna is offline
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Freddie, is there an advantage to putting the muffler up front like that? I thought the school of thought was to keep them as far back in the system as possible. I guess since you have the option of opening those butterflies and running completely open muffler placement wouldn't really matter in your application.

Thanks!
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Old 06-05-2012, 10:18 AM
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Whether you do a muffler then y pipe, or a muffler that has a y pipe inside of it, it won't really make much of a difference. I'd go with the cost effective muffler(single 3"in/out). It'll essentially be the same setup.

If the tailpipes are stock, they should be 2.25" not 2.5".
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Old 06-05-2012, 10:20 AM
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my muffler is as rear as I could get it...

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Old 06-05-2012, 10:26 AM
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yes, by going to 2 > 1, it gave me a bigger option for when I do open the cutouts..when I spray, the motor is taking in a bigger volume of air and thus needs as much flow as possible. The reason I stuck with a single exit was because i didn't want to lose the scavenging effect that wide open exhausts exhibit which affects low end tq..
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2005 Dodge Ram 1500 QC SLT: 12.107 @ 113.960 MPH
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Old 06-05-2012, 01:11 PM
GreatBigTuna GreatBigTuna is offline
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Thanks for the explanation Freddie. In the first picture the muffler looked much closer to the front. The second picture makes it much clearer.
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Old 06-06-2012, 03:58 PM
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Thanks guys. Ended up going with an 18" Magnaflow. Still sounds like a Hemi, but won't wake up the neighbors anymore
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Old 06-06-2012, 04:44 PM
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Very nice.........................
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