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Anthony
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1/29/2001
18:32:47

Subject: "Dual Exhaust" What size pipe??
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With all this talk about dual exhaust, what should be the recommend pipe size 2.25" or 2.50"? I have the 4.7 in my beast and I don't want to lose any low-end grunt, I would also want a little increase in mpg. The setup I want is not offered buy any exhaust companies, exiting behind the rear wheels.

One more thing I have the 4X4 option with the 31.5 x 10.5 tires including the spare, I notice that the spare is mounted more on the left side. Will this affect the tail pipe exiting on the left side? It looks kind of tight.

I'm thinking of this setup: running a dynomax ultra flo 1 in 2 out with 2.25 or 2.50 piping exiting behind the rear wheels, tips probably Gibson's slash tips which are polished stainless steel 3" size, with all aluminum pipes. What do you think??

Thanks in advance
Anthony

2000 Dakota Sport CC 4X4, 4.7 5spd, intense blue, fully loaded.



chris
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1/29/2001
19:43:38

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I would use the 2.5. I have the Gibson dual outlet catback 2.5 with 3" tips on my V6 and have no problems...Good Luck

Chris DeCrease
97 Dak 3.9 Sport 5-sp
3"Body Lift 33"BFG TA ko's

Bernd
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1/29/2001
20:53:52

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Yup...I totally agree as well. No more than 2.5" for the tailpipes.

Bernd D. Ratsch
1997 Dodge Dakota SLT
Supercharged w/Nitrous

Mark
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1/29/2001
21:01:40

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I have 2.5" up to the mufflers, then 2.25" past that with 3" chrome tips.

-Mark

tony
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2/21/2001
20:06:14

RE:
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I know that this is'nt the same situation as you
have but it may help in deciding on pipe size.
I ran 3" alumunized pipe from the cat to an 18"
magnaflow muffler and 3" tailpipe SOUNDS REAL GOOD
and performs better!One thing to keep in mind is
that if you go to big you don't get the proper
back pressure and the air is moving so fast that
the oxygen sensor dos'nt send the proper message
to the computer. good luck!
tony
2000 dakota 4.7 4x4




Bernd
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2/21/2001
23:20:15

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On a single system, the 3" hands down. On a dual system (even on a V8), no more than 2.5" unless you built the engine for high RPM driving or it's supercharged.

Bernd D. Ratsch
1997 Dodge Dakota SLT
Supercharged w/Nitrous

Anthony
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2/22/2001
08:47:08

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I decided to dump the idea of duals, and go with a dynomax 3" cat-back instead. This cat-back sound really good, my buddy has it on his truck and there is an increase in power.

Anthony



2000 Dakota Sport Plus CC 4X4 4.7, 5spd, 3.55, Intense Blue, Loaded

Anthony
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2/22/2001
12:05:21

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I decided to dump the idea of duals and go with a Dynomax 3" cat-back from Mopar. My buddy has this on his Dakota, man does it ever sound good and the power to boot.

Anthony

2000 Dakota Sport Plus CC 4X4 4.7, 5spd, 3.55, Intense Blue, Loaded

Eric Barger
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2/28/2001
08:18:06

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Anthony, were you able to install the Mopar dynomax unit yourself (with clamps and not welding)?

I figure I could remove the old unit and place that unit on the truck and go and have it welded and save myself some $$$.

Also, I couldn't find a exhaust system in the Mopar High Performance book for a 01 Quad Cab 4.7 Dakota. You wouldn't happen to know of one and a part number would you? I would rather buy Mopar if at all possible.

Thanks man,


ERic Barger

www.installuniversity.com




Anthony
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2/28/2001
11:56:09

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Eric I didn't get the cat-back yet,it should be easy to install it yourself as it is a bolt on system. Check if there's a part number for a 2000 quad cab, that should work too. The reason why i'm stalling is because I want to get the Gibson's duals, BUT the spare might have to come out which I don't want. Otherwise I'll go with the Mopar system.

By the way Dynomax makes Mopar's cat-back system.

Anthony


2000 Dakota Sport Plus CC 4X4 4.7, 5spd, 3.55, Intense Blue, Loaded

Eric Barger
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2/28/2001
12:39:29

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Thanks for the info. I went back by the dealership again this morning and we can't find a cat back for the quad cab. They are going to make some phone calls about it. I said screw it, and went by and had a mellatone muffler put on it.

This is a work truck so I just want to pep it up a little and get a little better mpg out of it. The mellatone is nice sounding and was cheap. :D

Thanks for the heads up. Now, on to figure out what intake assembly to get....

Eric



redbone
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3/01/2001
00:25:48

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back pressure is your enemy the more freely your exhaust is the beter it is and it wont mess with the o2 sensor

redbone

01 dak 3.55 sg stik

john walters

adam
Dodge Dakota
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7/18/2003
18:28:43

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what do you guys think about duals 50 series flow masters?



adam
Dodge Dakota
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7/18/2003
18:30:13

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also what kind of cat would you recommend?



01Motorsport
Dodge Dakota
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7/19/2003
17:37:09

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I've had both 50 and 70 series with duals on Daks. The sound out the back is nearly the same, the 50 is slightly louder, but the 70 eliminates floorboard noise. 50 is 16" long, 70 is 22".



sildak
Dodge Dakota
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7/20/2003
20:28:49

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if you want duals go 2.25. i have 2.5 and i am going to 2.25. had a 40flow went to super turbo big improvement. 4.7 like some back pressure.



Erik
Dodge Dakota
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7/08/2005
21:47:09

RE: flowmaster
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Hey guys, What size is the stock cat back pipe on a 2000 Dakota Quad with a 4.7L I want to buy the right size to just bolt it on!



Android287
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7/09/2005
23:56:11

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If you have one cat it is 2.5




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