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GSMarquis
Dodge Dakota
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4/21/2002
18:33:34
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 Subject: 4.7 Headers vs. manifolds $$$$
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I have read a few posts saying that the stock exhaust manifolds breath fairly well....is it not worth the money and install time to buy a set of headers for these 4.7's? If i should just get a cat-back than i would.
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Alex
Dodge Dakota
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4/21/2002
18:54:08
|  RE: 4.7 Headers vs. manifolds $$$$
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Headers are always better than manifolds.
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Horbedarn
*GenIII*
4/21/2002
21:08:00
|  RE: 4.7 Headers vs. manifolds $$$$
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I put the JBA headers on and didn't notice any power gain. If you want every little bit possible go ahead and do them but other wise it really isn't worth it.
2000, CC, SLT, 4x4, 4.7, 3.55, Auto
MBRP Dual Exhaust Cat-Back, JBA Headers, 72mm TB, 4" Z-Tube
3923's, 180 T-Stat, IAT Adjuster
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xplikt
Dodge Dakota
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4/22/2002
01:32:21
| RE: 4.7 Headers vs. manifolds $$$$
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Headers aren't going to be compatable with the Speedtweaks turbo -- so keep em how they are ;)
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TurboBlew
Dodge Dakota
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4/22/2002
02:58:50
| RE: 4.7 Headers vs. manifolds $$$$
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Hey Horbedarn, I dont understand why you wouldnt add more fuel to compensate for the headers you installed. If you dont notice any power gain, its because you've done something wrong!
Alex is correct, a cast factory manifold is a chokehold on the exhaust.
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Art
Dodge Dakota
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4/22/2002
03:03:33
| RE: 4.7 Headers vs. manifolds $$$$
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The stock 4.7 manifolds flow very well,just look at their swept back design,the headers will flow more on the top end and if you have a supercharger or turbo they would be worth it,these manifolds look better than the old 340 hp manifolds and Im sure they flow alot better too
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rtdkota
Dodge Dakota
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4/22/2002
12:22:27
| RE: 4.7 Headers vs. manifolds $$$$
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So far, I haven't heard of any increases with just a JBA header change over stock (on 4.7, 5.2L, OR 5.9L). The 3.9L sounds like it has had the only REAL benefit.
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conig
Dodge Dakota
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4/22/2002
13:20:42
| RE: 4.7 Headers vs. manifolds $$$$
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but most of the people with headers still run a catalitic converter. duner got 38hp from a high flow cat between 5000 and 5500 all that coudn't of been from just a 3 inch cat. the bottle neck on the 4.7l is the cat.
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Duner
Dodge Dakota
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4/22/2002
13:39:07
| RE: 4.7 Headers vs. manifolds $$$$
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I agree.... the bottle-neck is most definately the stock cat. Most likely the reason some of the intake and exhaust mods don't feel like they do much is because of the restriction the cat puts on the system. Not that I'm a tree-hugger environmentalist or worried about my emissions warranty - but I like the idea of replacing the cat with a larger one instead of gutting it. I guess it's the principal of it. I like to think that I'm trying to have my fun without totally disregarding the efforts to keep the air clean.
With that said...... I refuse to give up my 2-strokes! hehehe
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CW
GenIII
4/22/2002
19:37:29
| RE: 4.7 Headers vs. manifolds $$$$
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I will ride 2 strokes till I die. :)
2001 4.7 RC 5sp 3.92 LSD
Click on thumbnail for mods.
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TommyBoy
Gen III
4/22/2002
20:13:35
| RE: 4.7 Headers vs. manifolds $$$$
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I second that Duner.
They will have to pry my YZ from my cold, dead hands!
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