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Exhaust 5.7 HEMI Exhaust Discussion


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  #51  
Old 03-23-2011, 07:58 PM
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Sounds sweet timmmy!!!!
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  #52  
Old 03-24-2011, 05:14 PM
08murderedram 08murderedram is offline
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i have an 18 inch magnaflow muffler with the stock y pipe and was actually debating on getting the same y pipe you did and switching to a 14 inch magnaflow 1 in 2 out muffler because i want the same deep throaty tone but a little louder. did u notice a big difference with the new y pipe??? was also considering throwing in the magnaflow hi flow cats
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  #53  
Old 03-24-2011, 07:24 PM
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The magnaflow Hi-flow cats replace the factory Y as part of the deal. It seems a little bit smoother with better response than before.
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  #54  
Old 04-03-2011, 12:54 AM
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Timmy, I know that you did a lot of research before you built your exhaust, great choices, and $250 well spent. Thank you for providing the ypipe part number. I have a couple of questions and didn't want to start a new thread.

What is the restrictive part of the factory Y; the factory bends, or where it funnels into one pipe?

If I wanted to stay SI/DO is this the right part number? 12388

At any time did you consider a DI/DO muffler?
I was thinking that I could skip the Y-pipe this way. If I were to do so, would this be the right part for in and out sizes? Magnaflow 12568

Would there be much of a difference between the 4X9, 5X8, and 5X11 oval style magnaflow's?

As you can see, I'm going with the longest MF muffler that I can find so it won't be too loud.

Thanks in advance for your help.

JR
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File Type: jpg 12388.jpg (12.7 KB, 40 views)
File Type: jpg 12568.jpg (55.1 KB, 40 views)
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  #55  
Old 04-03-2011, 01:01 PM
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The bad part of the Y is where it's smashed together. They take two 2 1/2" pipes and smash it into a 3" collector, so it heavily cuts the flow down.



I never thought about doing a dual pipe setup without the Y. I see the benefits of a true dual setup for high HP cars, but not really in the truck. I don't think the dual inlet/outet muffler would be the right way to do it. Most of the people run two single inlet/outlet mufflers with an h pipe or x pipe to maintain low end torque.

That 12568 would be a good choice to run dual in dual out, but I would have to ask the builder to see what he thought about it. The Y into a single 3" helps maintain the lower end torque. You would probably have to spend time dyno tuning to see the benefits of a dual pipe setup. And the 12388 would be a good choice for the single in / dual outlet.

Also 5X8 and 5X11 are just different internal volumes. The 5X11 should be a tad bit quieter. The 4X9 are made for smaller cars.

And here is a thread with pics of the stock muffler cut open to see why it needs to be replaced with a Mag! http://ramforumz.com/showthread.php?t=71371

This picture shows how much heat was building up inside the muffler due to the flow characteristics.


Hope this helps!

Last edited by 916Timmy; 04-03-2011 at 01:07 PM.
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  #56  
Old 04-08-2011, 11:05 AM
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Thats awesome was just under my truck yesterday trying to figure out how to make a new y pipe
I had already built a 3" inlet to two 2.5" outlet and ran 2 single chambers to two tail pipes out the back
And I wanted to run true dual now I see how to make the y pipe. Instead of running back into the 3"
Just going to run straight back to mufflers. When I do this I will be sure to post pics thanks again
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  #57  
Old 04-09-2011, 10:09 PM
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Thumbs up Y-pipe

This is an awesome thread. I have been poking around the site looking for ways to rework the exhaust without forking out a small fortune on an ARH set. Even if someone were to find a reasonable set of shorty headers you would still have to contend with that awful stock y-pipe. This post just answered all of my questions and I should not have to spend a grand to do it. Very Nice.
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  #58  
Old 04-12-2011, 08:39 PM
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I had the Y-pipe and muffler replaced with magnaflow parts today.
Re-routed drivers side pipe from cat to go above crossmember and back
further after trans and then crossing over to the Y instead of the stock
location which cooks the tranny fluid. The factory Y is really constricted
as you can see in the first pic
Attached Images
File Type: jpg IMG_0764.jpg (123.8 KB, 186 views)
File Type: jpg IMG_0767.jpg (123.3 KB, 203 views)
File Type: jpg IMG_0769.jpg (133.3 KB, 213 views)
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  #59  
Old 04-12-2011, 10:40 PM
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Looks pretty good, don't know why they used clamps and cut n weld instead of bending one pipe section. Placement looks good. How's it running compared to stock? Mine was a big difference in the way the motor spools up
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  #60  
Old 04-12-2011, 10:41 PM
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Thanks! ARH is in the DISTANT future for me too, then all the y pipe is coming out, the headers have a good setup built in. I spent a whopping 250 bucks on everything from the muffler, y and the install

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Originally Posted by Ram Pants View Post
This is an awesome thread. I have been poking around the site looking for ways to rework the exhaust without forking out a small fortune on an ARH set. Even if someone were to find a reasonable set of shorty headers you would still have to contend with that awful stock y-pipe. This post just answered all of my questions and I should not have to spend a grand to do it. Very Nice.
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