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bmroz
Dodge Dakota
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4/24/2004
13:25:24
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 Subject: 3.9 performance
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Message:
Hey, I recently purchased a 98 dakota RC, 3.9L 2WD(love it!!) I'm definatley looking forward to giving my ride more power. So far I've purchased a K&N Air Intake (Already feel a bit more power and gas mileage improved slightly). I also put a 180 T stat(much cooler). I've yet to purchase a flowmaster 40 series muffler and pipes, not sure what size to get: 2", 2-1/2" ???? And type of configuration.
I've been browsing around other threads, but wanted to get advice on my particular truck. I'm not looking to spend a whole lot of money right of the bat, I wanted to start simple and work my my up. Anybody have any feed back or advice(Sorry I'm just a rookie) Thanks all!!
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99DAK
Dodge Dakota
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4/24/2004
23:47:15
|  RE: 3.9 performance
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The conventional wisdom around here seems to be that if you're doing the exhaust you need a bigger throttle body to get the most out of it.
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another mark
Dodge Dakota
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4/25/2004
16:56:53
| RE: 3.9 performance
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No bigger than 2 1/2" in on the muffler and either single 2 1/2"
out or if you want dual tips 2 1/4" so you don't lose important
backpressure. Muffler brand is up to you, there are other
choices besides Flowmaster. As someone who has modded the
hell out of their truck, the F&B 48mm throttle body is highly
recommended. That was my single biggest performance gain
and you can feel it where you sit no bones about it.
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bmroz
Dodge Dakota
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4/25/2004
17:38:59
| RE: 3.9 performance
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Nice! I most def going to look into the Throttle Body. I think I just changed my mind on my next mod. And maybe I'll go with the exhaust next. Thanx!!
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Matt
Dodge Dakota
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4/25/2004
22:07:44
| RE: 3.9 performance
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Build the intake side up first. When you do the exhaust, either stick with 2.5" for single or drop to 2" for true duals. Do yourself a favor and regardless which road you go down, cut the stock y-pipe off and go from there. The stock y-pipe is the 2 2" pipe off the manifolds crushed together and attached to a 2.5" pipe. It's super restrictive. So either get a 2" in/2.5" out y-pipe, or pay for a custom 2"in/out x pipe for duals. Do what you will with the cat. You'll be much happier.
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bmroz
Dodge Dakota
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4/26/2004
20:03:55
| RE: 3.9 performance
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thanx for all the input!!! Can't wait!!!
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Bob Lincoln
Dodge Dakota
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4/26/2004
21:15:44
| RE: 3.9 performance
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Is the F&B 48mm throttle body a straight bolt-on mod, or is there some rework involved?
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Slow Guy
Dodge Dakota
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4/26/2004
21:23:21
| RE: 3.9 performance
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Should be a direct bolt-on.
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Where is it
Dodge Dakota
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4/27/2004
09:07:08
| RE: 3.9 performance
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I tried to google F&B and couldn't find it. What does F&B stand for????????????
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Slow Guy
Dodge Dakota
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4/27/2004
22:37:34
| RE: 3.9 performance
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www.fbthrottlebodies.com
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another mark
Dodge Dakota
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4/27/2004
23:12:13
| RE: 3.9 performance
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You just need to modify your air hat a little by enlarging the hole, it's easy enough to do with a utility knife.
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hmm
Dodge Dakota
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4/27/2004
23:56:23
| RE: 3.9 performance
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Bmroz if you live in California it's illegal to remove that y-pipe and replace it with anything but another stock pipe or a CARB E.O. part. Just so you know.
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Bmroz
Dodge Dakota
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4/28/2004
19:16:34
| RE: 3.9 performance
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I live in NY, but i might take the chance any way.
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DakotaV6
Dodge Dakota
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5/01/2004
18:42:23
|  RE: 3.9 performance
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I have 3" exhaust on my dakota and got more hp out of it than the 2".
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greg555
Dodge Dakota
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5/08/2004
06:57:03
| RE: 3.9 performance
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if you have the air intake yeah you can do a bigger exhuast. if not it'll jsut wipe out your bottom end. i have jba headers and y pipe into a 3" exhuast, no cat, 40 series flowmaster dumped before the axle. it worked well with my old engine which was heavily modded. got a older (replacement) for now and its straight stock. and i can feel the difference.
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