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DeereFarmer
Dodge Dakota
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11/05/2007
17:41:54
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 Subject: Free Flow Cat?
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I have a '03 Dakota 4.7L that is stock other than a Flowmaster 40 muffler with dual pipes out the back. I lost a little low end grunt when I has the muffler installed. I can hardly tell. I love the sound. I've been thinking of doing a free flow cat next. What will this do to the sound? I want the same tone, maybe a little louder. How does it do for performance? What is a good brand to look at? Thanks.
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Dennis
Dodge Dakota
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11/05/2007
19:55:34
| RE: Free Flow Cat?
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Your dakota already has a free-flowing cat from the factory. Negligible loss of exhaust gas flow through it.
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DeereFarmer
Dodge Dakota
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11/05/2007
20:22:45
| RE: Free Flow Cat?
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Really? I never knew that. What if the first two cats went missing? I'm pretty sure I have two small ones upfront and then the bigger one more towards the muffler, right?
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Marv
Dodge Dakota
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11/05/2007
23:37:37
| RE: Free Flow Cat?
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Well, that's a question only you can answer, by crawling under. A couple different configurations that year, depending on the area of the country or state it was sold.
Go look.
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Kowalski
GenIII
11/06/2007
16:56:10
| RE: Free Flow Cat?
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If you have the 2 precats, that's where your O2 sensors are. Removing those would set the MIL.
Lead, follow, or get out of the way
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DeereFarmer
Dodge Dakota
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11/07/2007
20:22:55
| RE: Free Flow Cat?
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I checked and I have two pre-cats and the large cat. Would removing the large cat do anything? I doubt that I can because of state laws around here.
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Kowalski
GenIII
11/08/2007
17:08:49
| RE: Free Flow Cat?
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Message:
Might be worth a couple HP, not much, and like you say - could be a problem with inspections. Federal law, I think, as well as some states. Have you done anything with the y-pipe yet ? That seems to be the major exhaust bottleneck. Some stock styles are more dinged in and restrictive than others; I've seen at least 2 different stock designs. There are some better flowing aftermarket ones.
Lead, follow, or get out of the way
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DeereFarmer
Dodge Dakota
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11/09/2007
14:47:48
| RE: Free Flow Cat?
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Message:
I havn't even thought about the Y pipe yet. What will that do to then sound? I'll havce to look into it.
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Kowalski
GenIII
11/10/2007
07:56:50
|  RE: Free Flow Cat?
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So you're another one of these guys who cares more about sound than performance ? I always liked the sound of any motor I had that would pull away from the competition...
Lead, follow, or get out of the way
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DeereFarmer
Dodge Dakota
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11/10/2007
08:36:41
| RE: Free Flow Cat?
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Hahaha, yeah. I'm all about sound. If I can gain some performance, then it's even better. As long as I don't loose any performance then I'm happy.
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Kowalski
GenIII
11/10/2007
08:47:28
|  RE: Free Flow Cat?
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Won't change sound much; more of a performance mod.
Lead, follow, or get out of the way
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DonGenII
Dodge Dakota
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11/11/2007
13:09:50
| RE: Free Flow Cat?
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Message:
How about some info on where one could get the aftermarket why-er-y pipe? Can the stock v-8 fit stock v-6? Are there years that are more free flowing than others. Mine are 94's v-6's.
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01Motorsport
Dodge Dakota
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11/12/2007
10:28:34
| RE: Free Flow Cat?
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Hi-flow catalytic converters and y-pipes at: www.magnaflow.com I have larger primarys/y-pipe/hi-flow cat/Magnaflow 22"/2 1/2" duals on my '01 4.7. Larger pipe diameters and hi-flow cat make the exhaust louder, but the 22" muffler makes up most of the difference. I went for more performance/mpg/sound without interior resonance; cake and eat it, too. If I had to "pick" something, the y-pipe and hi-flow cat made the biggest difference.
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garrett
Dodge Dakota
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11/12/2007
11:37:02
| RE: Free Flow Cat?
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Message:
sorry to post like this but do you guys know where the o2 sensors are and what tools you need to change them out. I have a 00 4.7 slt thanks for the info.
by the way i love the sound of my MBRP exhaust.
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