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Exhaust 5.7 HEMI Exhaust Discussion


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  #1  
Old 04-16-2010, 08:12 AM
ShotGunWillie ShotGunWillie is offline
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Default Exhaust Questions, concerns, and general stuff that has been stated time and time

Okay, I have heard a few clips on You Tube of the Flowmaster 50, I think it sounds pretty good, but that's really all I know about any exhaust. Here are my questions or concerns, they've been numbered for your viewing pleasure.

1. Dual exhaust, what exactly is dual exhaust, one shop explained that it is one inlet, two outlet and another said true duel exhaust is two mufflers, single inlet and outlet.

2. I am not the biggest fan of duals coming out the back, whether they are straight or "Y"'d out, just not, don't know why. Any how, does it matter with performance of the exhaust?

3. What gains in what areas can you expect from a Flowmaster or Flowmaster Type muffler?

4. In order to have the gains, what do you have to replace, from the manifold back or just the muffler and tail pipe?

5. Drone, how will I know if there will be drone in the cab. I like a little rumble but this "drone" I keep hearing about makes me wonder if I am going to have to shout in order to have a decent conversation in the cab.

6. "Dumping" it, if I get just the muffler and dump it, without coming out the back side with a single or dual pipe to behind the wheel or bumper, do I lose or not get the full potential from the exhaust?

7. What size of a 50, is bigger better, which one is best for my truck?

8. I don't like to make lists and end at an odd number.
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  #2  
Old 04-16-2010, 08:59 AM
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jeees man just leave it stock . exhaust is exhaust . engine has to exhaust be it noise or quiet . you wont know any difference except the noise . megaflow is my choice have the 3 inch in and 2 21/2 out . does me just fine .
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Old 04-16-2010, 09:02 AM
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1. Correct as it was explained to you.

2. You can still run true duals and have both pipes exit at the same point.

3. Flowmaster and other performance exhaust systems are designed to reduce any backpressure in the system allowing for higher flow, especially at higher RPM's.

4. Typically, a cat back system works best.

5. Personally, I think the drone you get from chambered mufflers sounds like crap on a Hemi with MDS. I prefer the sound of a Gibson or Borla system. Search YouTube for video/audio clips of Rams with various exhaust systems.

6. You'll notice no real difference except the volume level in your cab will be louder.

7. Not really sure what you're asking here.

8. Just because you dislike odd numbers.....
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Old 04-16-2010, 10:09 AM
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Nice post Remerson I'm not sure about #7 either
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Old 04-16-2010, 10:41 AM
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I'll offer up my .02 worth...

Quote:
Originally Posted by ShotGunWillie View Post
Okay, I have heard a few clips on You Tube of the Flowmaster 50, I think it sounds pretty good, but that's really all I know about any exhaust. Here are my questions or concerns, they've been numbered for your viewing pleasure.

1. Dual exhaust, what exactly is dual exhaust, one shop explained that it is one inlet, two outlet and another said true duel exhaust is two mufflers, single inlet and outlet.

A true dual is two cats, two mufflers, a crossover pipe & two tail pipes.

You can get a single inlet/dual outlet muffler with two tail pipes. That's the arrangement I have.


2. I am not the biggest fan of duals coming out the back, whether they are straight or "Y"'d out, just not, don't know why. Any how, does it matter with performance of the exhaust?

Any sharp bend in the pipes, such as a right angle out to the tip, will constrict the pipe a little bit but it will not have a significant impact on your performance unless you are going for 800+ HP. If you want to avoid the look of the dual tips out the back, try a simple turn down with a bevel cut just below the lower line of the bumper. You only need a little bit of pipe there to clear the bumper and not carbon it up.

3. What gains in what areas can you expect from a Flowmaster or Flowmaster Type muffler?

True gains are not realized unless you have more air coming in with a cold air intake. The internal combustion engine is just a big air pump. More air in + more air out = more HP. Be wary of any claims made on HP gains. For some HP gains & improved throttle response you can feel, go with the basic mods - intake, exhaust and a programmer.

4. In order to have the gains, what do you have to replace, from the manifold back or just the muffler and tail pipe?

Many folks will tell you that you need to add headers, high flow catalytic converters, a dual system all the way to the back. However, you will realize some appreciable gains with the basic mods described above. The stock exhaust system, from the muffler back, is pretty restrictive and replacing it with a catback system is the most common upgrade folks will do.

5. Drone, how will I know if there will be drone in the cab. I like a little rumble but this "drone" I keep hearing about makes me wonder if I am going to have to shout in order to have a decent conversation in the cab.

Drone, when the engine slips into MDS mode, is common. To avoid it, get a catback system that includes a resonator on the tail pipe. If you go with a dual tail pipe system, then it's one resonator per pipe. I do not currently have a vehicle equipped with MDS but I've ridden in vehicles with a catback with no resonators that were equipped with MDS and it was bad. One way to avoid drone and not have resonators is to turn off the MDS function with a programmer.

6. "Dumping" it, if I get just the muffler and dump it, without coming out the back side with a single or dual pipe to behind the wheel or bumper, do I lose or not get the full potential from the exhaust?

Shortening the exhaust has no serious affect on performance as long as, if you go with a dual system, that you "dump" it after the crossover pipe.

7. What size of a 50, is bigger better, which one is best for my truck?

Sorry, no idea what is better here. I just went with a Magnaflow single in/dual out unit that was considerably smaller & lighter than the stock can.

8. I don't like to make lists and end at an odd number.
LOL.

Good luck with your choices.
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  #6  
Old 04-16-2010, 10:48 AM
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I think the #7 Question pertains to; what do the #'s/series mean, and what is recommended for my truck.

A. The larger the series # ie. 40, 50, 60, the quieter/less aggressive the decibal/tone. I recommend the series 50 or 60, I think the 40 is a bit obnoxious for a daily driver, esp. if you pull a trailer much. I really like my 18" magnaflow, just enough louder...yet not too loud. I agree that the Flowmaster is prob. my 4th choice compared to Borla, Gibson, and Magnaflow.
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  #7  
Old 04-16-2010, 12:46 PM
ShotGunWillie ShotGunWillie is offline
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X pipe, H pipe, Y pipe, Q, what the heck is all of this.

So if I coupled a CAI with just a muffler change, would I see any difference.
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Old 04-16-2010, 01:03 PM
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Well, basically, the "X", "H" or crossover pipe refers to two pipes that are connected downstream in the exhaust system.

Configurations are designated by the letter used. For instance, the "X" pipe looks just like this - X

The "H" pipe looks just like this - H

So, the two configurations add the crossover between the parallel dual pipes.

The crossover pipe, whether it be an X or an H (most folks prefer the X type as it flows better) is placed in a dual system to allow the exhaust gases to "crossover" as they begin to cool and the exhaust gas pulse frequency changes. It promotes efficient exhaust gas scavenging.

An old racer's trick, to determine the proper place for the crossover, was to paint the inside of each pipe in the dual system. The heat will burn off the paint but as the gas begins to cool, the paint remains. At the point the paint is still on the pipe, that is the upstream location for the crossover to be installed.
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Old 04-17-2010, 03:09 PM
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If I upgrade. 24" Mufflex from ebay. My .02. Magnaflow is good. Had them on the Lightning.
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Old 10-25-2011, 10:05 PM
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Wow. Never heard of that but makes perfect sense. Thank you. I will use that when applicable.
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