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Custom Dodge Ram Performance Mods - Engine - 5.7 HEMI V8 Discuss modifying your Dodge Ram with Performance Parts and Accessories!
Factory Spec: 5.7-liter HEMI® V8 engine - 390 horsepower, 407 lb-ft of torque.


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  #141  
Old 12-19-2013, 10:01 PM
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I didnt read this whole thread but has anyone considered that the constrictive stock pipe may be for back pressure for when the MDS mode is on? Not that it would stop me from pulling that stock Y....just thowing it out there....
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  #142  
Old 12-20-2013, 11:57 AM
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Quote:
Originally Posted by mygt8a4re View Post
I didnt read this whole thread but has anyone considered that the constrictive stock pipe may be for back pressure for when the MDS mode is on? Not that it would stop me from pulling that stock Y....just thowing it out there....
I haven't heard any hard data , my personal experience is that I haven't noticed a difference in MDS since installing the Y-pipe
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  #143  
Old 12-20-2013, 12:20 PM
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Back pressure or not I chose to get rid of the stock Y-Pipe because I wanted to move the cross over pipe away from the transmission pan so I could drop the pan.


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  #144  
Old 12-20-2013, 06:33 PM
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Quote:
I didnt read this whole thread but has anyone considered that the constrictive stock pipe may be for back pressure for when the MDS mode is on? Not that it would stop me from pulling that stock Y....just thowing it out there....
How would restriction in the exhaust help mds? It doesn't matter if it's a 4 cyl, 8 cyl, etc, pressure(restriction) in the exhaust is always bad for performance potential. The back pressure saying is BS and a myth.
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  #145  
Old 12-25-2013, 11:03 AM
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Quote:
Originally Posted by snrusnak View Post
^ what they are saying is correct. The stock pipe is SS, it has mandrel bends, and the diameter is about as perfect as it gets for the application. Whether you have the single or dual exhaust, they are both great. The weak points of the exhaust (ignoring the manifolds) are the y pipe and the muffler. I would actually bet that the stock exhaust with just a magnaflow muffler installed(keeping stock resonators) would perform better than their cat back, because they use 2.5" duals on the cat back where oem is 2.25". The 2.25" provides more than enough flow, but has smaller diameter so gives higher exhaust gas velocity. Of course the difference here will be slight if even noticeable, but my point is you don't need to spend the money on a cat back, and it technically may even perform worse.
I like your reasoning Snrusnak. Do you know if all the factory dual exhausts are 2.25"? I'm planning to do the Y-pipe (and replace the other flattened section) and install an 18" or 22" Magnaflow muffler. So if the stock exhaust is 2.25" I assume I'd need a 3"- 2.25" Magnaflow muffler. Correct? I think I've located a shop that does mandrel bending as well.
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  #146  
Old 12-25-2013, 04:10 PM
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I had a Flowmaster 50 installed last weekend and noticed my Y pipe is pretty smashed in as well. Think i will skip the Y pipe for now until i do headers.
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  #147  
Old 12-26-2013, 09:39 AM
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Quote:
I like your reasoning Snrusnak. Do you know if all the factory dual exhausts are 2.25"? I'm planning to do the Y-pipe (and replace the other flattened section) and install an 18" or 22" Magnaflow muffler. So if the stock exhaust is 2.25" I assume I'd need a 3"- 2.25" Magnaflow muffler. Correct? I think I've located a shop that does mandrel bending as well.
I'm pretty sure all the duals are 2.25". That's what everyone on the forums says anyway. I don't actually have one as I have a single exhaust.
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  #148  
Old 12-26-2013, 09:54 AM
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I think that is a GREAT mod. I remember looking under my 05 and thought that the stock Y pipe was a joke. This post made me want to look under my 13. I really wasn't expecting to see that! Now that's how an exhaust should look.
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  #149  
Old 12-26-2013, 10:17 AM
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Quote:
Originally Posted by snrusnak View Post
I'm pretty sure all the duals are 2.25". That's what everyone on the forums says anyway. I don't actually have one as I have a single exhaust.

OK cool. Thanks. I guess i could just get out there and measure it myself. I'm just being lazy.
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  #150  
Old 12-26-2013, 11:23 AM
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Back pressure is certainly not a myth I've installed countless exhaust systems on numerous vehicle, mostly high performance, and had many of them dyno'ed. A certain degree of back pressure is necessary within the band width to generate the highest torque numbers.

While I agree that restrictive exhaust is "generally" not good for high hp set-ups, replacing the Y on a 395 hp vehicle will have negligible effects. Additionally, what hp gains that may be achieved by this mod will probably be negated by the tq losses...

If it improves the sound, then that alone may be enough to justify the install, but if you're seeking big gains, then look elsewhere...
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