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ccman
Dodge Dakota
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9/30/2004
00:18:05

Subject: exhaust trouble
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I have had a flowmaster 50 series on for about 4 months now. I had the 180 thermo in, autolite plugs(3923 platinums @.045 gap), K&N drop in, crank mod, tps mod, brass cap & rotor, JB wires, modified inlet tube to airbox (bigger), and the truck has never seemed to run right since i put the exhaust on. Its had plenty of time to break in. I wasn't getting any better gas mileage with these mods as i was without them plus until the truck got warm I had a lot of bucking and carrying on. I put all the factory stuff back to where it was, sensors, etc, but kept the wires and rotor and cap and K&N filter. I put the champ plugs back in too. I couldn't see the sense in keeping the 180 thermo in cause without other mods in probly don't do anything so i put the 195 back in. The truck runs much better now and i'm still pulling the same gas mileage. But the muffler is still on there and the truck is still not really running great, very sluggish. Can these mufflers actually make our trucks run worse? In my opinion it ran better with the factory muffler so i think i'm putting that one back on. I know there will always be arguments as to how good these mods are and how bad they are but do these mods really help or do they cause more problems. I have a 2002 rc sport 5 spd with 33k on it. I would like to hear from both sides if anyone is interested in taking the time to post. thank you



GB2000
GenIII
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9/30/2004
08:27:16

RE: exhaust trouble
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What size pipe are you running? If you went over 2.5" single in/out or 2.25" single in/dual out, you may have lost too much backpressure. That's my best guess. Other possibilities: bad O2 sensor(s), clogged cat?

Josh

http://www.cardomain.com/id/sentenced

Randy
Dodge Dakota
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9/30/2004
10:12:14

RE: exhaust trouble
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I agree with what GB2000 said about going too big with the flowbastard, however you've got a 5spd so the low end loss isn't as noticable. What size muffler are you running? Actually what drew me to this post is your 50 series muffler. I know what a 40 series 2.5 in/dual 2.25 out sounds like (garbage), but please tell me your thoughts on the interior/exterior sound of your 50 series. I'm looking into getting a 50 series 2.5" in/dual 2.0" out 50 series (9425502) for my 3.9.
To stay on topic, I do think your problem is with your cat, probably the third one, which isn't monitered by a sensor, which is why you're not throwing a code.



ccman
Dodge Dakota
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9/30/2004
12:37:59

RE: exhaust trouble
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i'm running 2.5 pipes. I just dropped the muffler in place of the factory and used all the old pipes. I ran straight out the back instead of the bend that comes out from factory. I have a dual tip SS tip, looks very nice. As far as sound, well, it's ricey but probly not as bad as the 40 series. Interior sound is noticeable when windows are up. If I had the chance to do it again i wouldn't. that is why i'm thinking of putting the factory muffler back on but keeping the tip, at least it will look nice. I think I lost a lot of back pressure as is now and i kept the 2.5 inch pipe.



Randy
Dodge Dakota
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9/30/2004
13:52:04

RE: exhaust trouble
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thanks for the info on the 50 series. The one I want has dual 2" outlets, and it's been my experience that smaller diameter tailpipes will produce a quieter sound. But it is the interior resonace I am worried about, and that probably wont change no matter what diameter tailpipes I have coming out of the muffler. Unfourtunatly for me, I have found no other company that makes a muffler in this size, and I need the small 2.0" diameter exits for the custom bending that needs to be done.



jared
Dodge Dakota
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9/30/2004
19:29:04

RE: exhaust trouble
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ccman,

I had the same problem your having when I hade a Gibson exhaust system on my truck. 2003 sxt 5sp. I replaced the muffler with a flowmaster 70 series (2.5 in 2.5 out) and noticed a significant improvment. I used the gibson pipes because they are mandral bent and the factory ones are not...

Randy,

The interior noise is not bad at all. Its louder than stock but much quieter than most performance mufflers available. If yor concerned about the noise, the 70 would probably be a good choice. Also, the only mods I have are the muffler and an airaid intake, With those mods I gained about 2 mpg on the highway.

Let us all know what you do.



ccman
Dodge Dakota
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10/02/2004
00:08:55

RE: exhaust trouble
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running it straight out the back would not have changed any performance would it? I mean as opposed to the bend that the factory puts in behind the passenger side wheel cause i cut that bend out and extended out the back with straight pipe. It is more hiddend and looks very nice with the dual SS tip coming out the back under the bumper but i just don't think i like the 50 series and don't know if I'll spend the money for another. It was quicker with the factory muffler. As for interior noise, only very noticeable with the windows up but you can still here your radio and talk normal to someone and its only around 2500-3000 rpms you get the most pitch out of the 50 series with my truck.



jared
Dodge Dakota
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10/03/2004
18:17:56

RE: exhaust trouble
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The exhaust shape behind the muffler should not make any difference.



Randy
Dodge Dakota
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10/03/2004
18:33:20

RE: exhaust trouble
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I talked to mike over at hearthrob exhaust and he is putting a kit together for me that has the exits where I want them. The muffler is a fully welded double wrapped single in/dual out. It's supposed to be significantly quieter than flowmaster even though the intermediate pipe is 3" and the muffler has a 3" inlet, which concerned me, but he says the inlet of the muffler reduces to 2.5". Then it's got dual 2.5" outlets and the tailpipes are mandrel bent. The whole system is aluminized and he's bending the tailpipes to exit on an angle behind each rear wheel. shipped it's costing me less than $300.



firegoat
Dodge Dakota
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10/03/2004
19:24:37

RE: exhaust trouble
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What's an average price on putting in a good exhaust system from the muffler back? I'm thinking about a flowmaster 70 series with dual 2" out the back. Would I have a relatively throaty sound out the back, and would that give me a dramatic increase in power?



Chip B.
Dodge Dakota
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10/04/2004
06:08:20

RE: exhaust trouble
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Increase in power?...yes...Dramatic increase?...no...Throaty?...well, yes and almost boardering on buzzy..but the 70 series is one of the better choices...and sounds best with no tail pipes.



jared
Dodge Dakota
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10/05/2004
18:59:08

RE: exhaust trouble
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I have the 70 on mine with a single 2.5" tail pipe. For a V6 it sounds good. Do not expect any muffler to make your six sound like a v8.
I got the muffler through summit for about $100. I don't remember the exact price. I have been happy with it so far



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