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Jessica
Dodge Dakota
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9/19/2002
16:53:09
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 Subject: Exhaust
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Message:
I have a 2000 dakota V6 and I want to put exhaust. Can anyone recommend an exhaust that isn't going to make my truck sound like a little jap car? Thanks
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2kPatriotBlue
Dodge Dakota
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9/19/2002
17:18:46
|  RE: Exhaust
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I just installed a Gibson Dual Sport on mine. I wanted dual exit but not loud inside the cab. It's louder than I expected but they say Flowmasters are louder. A lot of guys like MBRP as well but I thought they were a little high priced.
Any of those will give you a nice sound and not sound "ricey", but your not going to get a total V8 sounds either. I think mine sounds great at an idle, deep and throaty, but at speed you'll still have that V6 drone no matter what.
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Redak
Dodge Dakota
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9/19/2002
17:43:06
| RE: Exhaust
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I just put a Vortex Exhaust System on my V6 and it sounds awsome!
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Redak
Dodge Dakota
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9/19/2002
17:47:27
| RE: Exhaust
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I just put a Vortex Exhaust System on my V6 and it sounds awsome!
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92Dak
Dodge Dakota
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9/19/2002
18:38:59
| RE: Exhaust
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Try the magnaflow. A local muffler shop told me that my 3.9 is the best sounding V6 they ever heard.
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dakotav6/
Dodge Dakota
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9/20/2002
20:44:01
|  RE: Exhaust
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I got a flowmaster 40series on my dakota v6 manual and everybody says it sounds like a v8 my top end speed was a lot better but of the line was a little bit slower.
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Pistolero
Dodge Dakota
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9/21/2002
02:17:22
| RE: Exhaust
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I also vote for the Magnaflow...quality and true performance together, plus a very nice sound. I haven't heard one on a Dak V6, but I have on a Chevy...almost indistinguishable from a V8. That's what's going on my 2002.
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ramminstyle
Dodge Dakota
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9/21/2002
02:32:22
|  RE: Exhaust
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Message:
do you all think 3 inch cat backs are too big?
will that change my hp or torque in low range?
any advise as how it will effect my horse,
etc....thanks......but to offer advise on the above
go with a dynomax muffler and (if it wont hurt
power) a 3 inch cat back.....sounds real nice, i
get tons of compliments....by the way, i was
intending to say this is on a 3.9
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billybob
Dodge Dakota
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9/21/2002
03:43:30
| RE: Exhaust
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Message:
heck guy if you wanna go too big, (2 inch on duals ans 2.5 on singles is recomended) why don't ya go down to your local desiel dealer and have em make a custom set out of 4 inch. That'll cut your torque even more then the 3 inch did.
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black99dakota
Dodge Dakota
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9/21/2002
04:04:07
| RE: Exhaust
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I put a flowmaster on my 3.9 liter v6 and everyone says it sounds incredible, just as loud as a v8. i had the pipes cut too if that helps. better top speed and accel. as well.
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Drew
Dodge Dakota
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9/21/2002
14:22:47
| RE: Exhaust
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Ravin' Performace Mufflers ROCK!!!
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jrock817
Dodge Dakota
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9/21/2002
17:55:06
| RE: Exhaust
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i have a v6 and today just placed a flowmaster 40 2 chamber muffler with a few tricks to keep the rest of it original and it sounds great... only cost me 60 bucks and an hour on a lift and a saws all
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jrock817
Dodge Dakota
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9/22/2002
10:21:59
| RE: Exhaust
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Message:
all exhausts are going to sound better than original but remember that your low end is gonna suffer especially cuz of our low end in the first place my low end gas mileage is shot now but high end is off the charts better so it really makes no gas mileage difference
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TimmyBlak
Dodge Dakota
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9/22/2002
19:54:51
|  RE: Exhaust
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Message:
I had a gibson set up and it sounded like a little rice burnner so i put a flowmaster 50 series on it. call summit racing and ask them for the right one that goes on the v6 dak. THERE ARE DIFF. ONES.
Summit will give you the right part #.
IT SOUNDS GREAT!!!!!
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NJQCDak
GenIII
9/23/2002
09:19:15
| RE: Exhaust
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Message:
Jessica,
Exhaust sound is a matter of opinion. It is probably best if you could hear some examples. Most exhaust performance are very close to one another so it depends on which sounds best to you. Check some exhaust websites. Sometimes they have sound bites. I have the a SS Gibson single side and I don't think it sounds like a ricer. My neighbor's camaro has Flowmaster and it's alittle louder than my Dak. Good luck.
'01 QC Sport, 3.9L V6, 5spd, 2wd, Volant Intake,
SS Gibson exhaust, MSD Wires, Accel Super Coil, NAPA Cap, Flometrics Billet 48mm TB , JBA Silver Ceramic Headers, Autolites 3923s, R/T front swaybar & Quickor rear swaybar
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SloDak39
Dodge Dakota
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9/23/2002
10:11:16
| RE: Exhaust
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Message:
I put a dual exit gibson on my 99 3.9 and it sounded awfull so i took it off the next day......some people like that sound but not me....it also made it more ball-less than it already is.....did not help top end either...and i have headers on it, too!! i think the only way to get a noticable power increase out of these things is to get a supercharger....
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eTraxx
GenII
9/23/2002
13:11:52
| RE: Exhaust
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Message:
I found the following re: back pressure. Interesing ....
http://web.tampabay.rr.com/redroby/3liter/exhaust.html
The effects of back pressure
A muffler is an ambiguity in the performance world, as it can have both good and bad effects on power output. Back pressure is essential for peak power in almost any application, even 6000hp alcohol-burning Top Fuel dragsters have some built-in back pressure. Before we begin this discussion, take note that 1 atmosphere is the pressure that air is at naturally (uncontained) at sea level.
During the combustion process, when the exhaust valve is open, all of the compressed (and depeleted) air-fuel mixture spills out from the cylinders as fast as it can, through your exhaust manifold, into your catalytic converter(s), the muffler, and finally out the tail pipe. The problem with this is, just before your exhaust valve is about to close again, your intake valve opens up, allowing the fresh air-fuel mixture to rush into the cylinders. This is called overlap, and one of the things you take into consideration when choosing a cam, because it can be used to your advantage.
If there was no valve overlap, it would be 100% impossible to completely irradicate all of the spent gases from the cylinder. This has a two-fold effect on power output, depending on what RPM the motor is running at. At low RPM, this effect actually increases torque, because the least amount of compression is lost during the intake stroke, and the ratio of intake to exhaust gases is high. Unfortunately, as the RPMs increase, there is increasingly less time to evacuate the exhaust gases during the exhaust stroke, and more and more depleted air-fuel remains in the cylinders when the exhaust valve closes. The motor becomes incredibly inefficient near its readline. A motor designed for high-torque applications, such as towing, tends to exhibit less valve overlap then normal. The type of cam used in this application is often called an "RV" cam, because a recreational vehicle doesn't need horsepower as much as it needs low-end torque to get it moving.
Your car would also run terribly if there was too much valve overlap as well. When exhaust gases rush out of the cylinder, they create a low pressure area in the cylinder and the exhaust system, sucking the intake charge right into the cylinder, and right back out into the exhaust system. This is called scavenging. When that air spills out, so does the fuel it was carrying, so the O2 sensor reports a rich condition to the computer, often causing further decreases in the amount of fuel the computer injects. At low RPMs, this effect is most pronounced as there is sufficient time to suck out a significant portion of the intake charge, reducing torque. As the RPMs increase, however, the extra velocity imparted to the intake charge increases the amount that squeezes into the cylinder after the exhaust valve closes, as the valve closes so quickly at high RPMs that barely any intake charge escapes through the exhaust system.
No doubt you see the dilemna posed to designers when they choose a cam for the motor - the right combination of power must be achieved at the intended RPM range of the vehicle - if this is a tiny four cylinder, which must spin high RPM to make any power at all, you have to design in a higher amount of overlap. If the vehicle is mostly intended for low speed towing, you design in a smaller amount of overlap for more low-end grunt. Overlap is one of the reasons why the four-cylinder Acura Integra GS-R makes 170hp at almost 7000 RPM, and your 3.0L makes 171lb-ft of torque at 2000 RPM.
You can't control your overlap without changing the cams, but the effects caused by changing the back pressure are the same. When you reduce back pressure, it is equivalent to increasing valve overlap, and when you increase back pressure, it is the same as decreasing the amount of valve overlap. That's why some people will say, "you need a muffler for torque", or, "you'll have more high-end, but less torque, if you run straight exhaust". They are right, but a muffler's purpose is to reduce sound output, not horsepower! By reducing back pressure in an exhaust system, you increase high-end horsepower at the cost of low-end torque.
You can compensate for this by increasing the velocity of the intake charge. Increasing the intake velocity has the added side effect of increasing back pressure, because there is more air to be evacuated during the exhaust stroke. Note that if you increase intake velocity past the limits of the exhaust system, the gains you achieve are diminished to the point of being non-existent. That power will be there when you do upgrade the exhaust system, which is why something as simple as upgrading the exhaust system can result in huge horsepower gains.
You can decrease back pressure by increasing the size of your exhaust manifolds, or using separate tubes for each cylinder (called headers). Increasing the size of the exhaust pipe and decreasing its length also helps, as well as installing high-flow catalytic converters and mufflers. Of course, you could just cut them off. Although it is illegal in the United States to remove the catalytic converter in a registered vehicle, the muffler is a different story...
eTraxx
Baton Rouge, LA
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