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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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  #151  
Old 12-28-2013, 11:08 AM
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sled92 sled92 is offline
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Quote:
Originally Posted by SteelTownStang View Post
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...

So does anyone who has done the y-pipe replacement have any feedback on this? I'm new to this stuff but I'd rather not lose any torque just to gain a little HP. Torque is more important to me than top end. Any feedback or thoughts would be appreciated.
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  #152  
Old 12-29-2013, 09:17 AM
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You won't lose low end torque.

I deleted my cats, went from the stock 2.25" downpipes that the 4.7L has to 2.5" downpipes, then a dual in single out muffler (y pip inside the muffler). And single 3" stock tailpipe. I can tell a power difference at all rpm. Most noticeable is cruising on the highway just giving it slight amount of pedal it pulls a lot more.
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  #153  
Old 12-29-2013, 10:32 AM
Drivin Blue Drivin Blue is offline
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Should I do the intake and chip before doing the exhaust and should I run dual exhaust or will it make no difference?
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  #154  
Old 12-30-2013, 09:02 AM
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A tuner is the best bang/buck by far. Then probably intake then exhaust. But intake and exhaust you probably won't even notice a performance difference.
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  #155  
Old 01-01-2014, 08:31 AM
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I have a 2014; is this mod applicable to this year as well?
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  #156  
Old 01-01-2014, 08:55 AM
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I have been looking at replacing the Y with the correct stainless pipe done with mandrel bends, the thing that stops me is there are no actual dyno #s (butt dyno dose not count) Has anyone done this to a stock truck and have before and after dyno #s I would also be interested to see if there was any MPG increase.
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  #157  
Old 01-01-2014, 08:57 AM
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Quote:
Originally Posted by snrusnak View Post
A tuner is the best bang/buck by far. Then probably intake then exhaust. But intake and exhaust you probably won't even notice a performance difference.
^^^^^ This^^^^^

Generally exhaust mods are to improve sound, not performance... You may think you have better performance because of improved sound, but a dyno will prove actual results...

BTW: Butt-dynos prove nothing... and are often misleading.
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  #158  
Old 01-01-2014, 09:36 AM
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Nobody is going to spend hundreds of dollars to see if they gained 2hp from an intake or exhaust that was already expensive. So you won't find a dyno on it.
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  #159  
Old 01-01-2014, 09:47 AM
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... probably not, I know that I wouldn't... That's why all of this speculation about performance gains will go unproven, like the existence of Bigfoot. Wait a minute, Bigfoot does exist- bad example.
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Last edited by SteelTownStang; 01-01-2014 at 01:32 PM.
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  #160  
Old 01-01-2014, 11:06 AM
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I looked under my 2014; same issue.

The pipe from the left back is also crimped as it runs under the composite transmission pan.
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