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Exhaust 5.7 HEMI Exhaust Discussion


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  #1  
Old 05-24-2012, 05:17 AM
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Question Y Pipe or True Duals?????

Hi everyone. I've seen a lot of posts on these MagnaFlow Y pipes, & since I'm getting ready to replace my factory muffler, I was wondering if it wouldn't be an advantage to stay dual all the way to a MagnaFlow dual in/out muffler instead of merging into a Y behind the cats, & having it Y again inside the muffler. I'm lifting my truck, & have already made arrangements for FastMan TB & CAI. I just want the Best flow possible for the money without losing needed back press. especially since i'm going to lose several MPG with the Lift. Can anyone tell me which exhaust setup would be best for my application?

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Old 05-24-2012, 01:07 PM
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If your thinking about running a dual set up i would go ahead and do it. However true duals will not have equal pressure so I would run an X or H pipe somewhere in there!
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Old 05-24-2012, 02:20 PM
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If you do duals all the way and don't put an x or h pipe then you will be losing power. A good y pipe setup will make just about the same power as a good x or h pipe setup, and save you a lot of money. There is only a very slight power difference with y, h, and x pipes. Maybe ~5hp.

Also, you don't want back pressure. Don't listen to people who tell you some back pressure is good for low end torque, that's not correct. The reason many people experience a loss in torque at low rpm with exhaust changes is because they go to too large an exhaust diameter, which slows exhaust gas velocity. You want high exhaust gas velocity because it helps "suck" the exhaust out of the engine. A y, x, or h pipe all also help add to the scavenging effect(sucking out the exhaust).

Just don't go bigger than 2.5" for duals and 3" for single and you won't lose low end torque.

Back pressure is always bad when talking about exhaust. You want the highest amount of flow AND velocity.
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Old 05-24-2012, 06:29 PM
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Thanks guys. I really appreciate your input here. I think i'll go with the true dual with X pipe into the MagnaFlow 22'' dual 2.5" in/out . Could either of you offer advise on my CAI? I'm on the ropes about purchasing the Vararam or Volant.
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Old 05-24-2012, 10:32 PM
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Post results after you do it!

Both are great intakes. I'm a believer that enclosed box intakes perform better, but the vararam is a good performer as it's sort of a ram air intake.
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Old 05-24-2012, 11:52 PM
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If you run a dual in/out muffler you won't need a balance pipe. Magnaflow and dynomax both make mufflers with an internal x
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Old 05-25-2012, 12:12 AM
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That is an option, but an x pipe before the muffler will give better performance than the perforated x pipe inside the muffler.
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Old 05-25-2012, 02:03 AM
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all good ideas, cant wait to see the results...
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Old 05-25-2012, 05:37 AM
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Why does the X pipe in front of the X muffler perform better? Just curious. I really don't mind the extra cost for real extra benefit. I tend to live by the philosophy "If you don't have time to do it Right........You won't find time to do it Over" if you know what i mean.

Btw.....Remove resonators or NO?
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Old 05-25-2012, 08:56 AM
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One reason is that every muffler with the x pipe inside that I've seen does not have a smooth flowing x pipe. Also, since the pipe inside the muffler is perforated you lose some of the scavenging effect since the exhaust gasses expand inside that pipe and into the muffler.

Don't get me wrong, it would still be a good setup to do it the other way, there will be little noticeable difference.
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