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4.7 Dakota
Dodge Dakota
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1/22/2003
21:44:41
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 Subject: True Dual exhaust, Good or Bad
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I have a 4.7 and I'm planning to put JBA Headers, and a custom full 2 1/2 inch exhaust, no cats, with catbox, and 2 spintech mufflers. Will I lose a lot of low end torque? Are the gains worth it?
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Rob454
Dodge Dakota
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1/23/2003
01:45:08
| RE: True Dual exhaust, Good or Bad
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personally i think you can get more power out of a single 3 inch than dual 2 1/2 inch on a 4.7
I dotn feel its worth it to go true duals
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cudashoe
DakotaEnthusiast
1/23/2003
02:01:02
| RE: True Dual exhaust, Good or Bad
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YES!!! HUGE GAINS!!
2000 4.7 5- speed, 1989 Shelby #799 White
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scott
Dodge Dakota
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1/23/2003
02:39:31
| RE: True Dual exhaust, Good or Bad
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I have a 93 gmc with a 305 in it I have headers and true duals on it, do I need two o2 sensors in it or is one ok, and If I need two can I splice into the one I have.
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Texas Todd
Dodge Dakota
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1/23/2003
08:53:33
| RE: True Dual exhaust, Good or Bad
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cuda,
Hugh gains? I read that the 4.7's manifolds were very descent stock, that's one reason why it has an awesome ci/hp ratio stock! Maybe with alot of other mods, like HC pistons, Radical cams, ported heads, etc.
Maybe the no cats thing.
Are you sure on a stock motor?
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cudashoe
DakotaEnthusiast
1/23/2003
11:02:02
| RE: True Dual exhaust, Good or Bad
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Message:
I installed JBAs with TRUE 2 1/2" duals, Dr. Gas X -pipe, no cats,and 40 series Flowmasters. And I estimate 15 hp increase.
This is AFTER I already had Leach PCM flash, cold air, and MBRP cat-back, removed third cat, IAT switch, removed clutch fan.
Trust me when I tell you, thjis is a fantastick mod!
2000 4.7 5- speed, 1989 Shelby #799 White
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CThomp
Dodge Dakota
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1/23/2003
11:07:31
| RE: True Dual exhaust, Good or Bad
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So how much did you spend for that 15h.p.? Seems pretty expensive for 15hp. Not that i'm knocking ya. But theres gotta be a cheaper way to get that same horsepower out of you exhaust.
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Texas Todd
Dodge Dakota
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1/23/2003
11:25:18
| RE: True Dual exhaust, Good or Bad
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OK, with all that, I'll trust 'cuda's butt dyno.
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cudashoe
DakotaEnthusiast
1/23/2003
12:25:02
| RE: True Dual exhaust, Good or Bad
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Message:
Well considering the below 2hp you get from these $400 TBs,its a bargain. I have just under $1000 in my exhaust.
But what my exhaust mods have done is stretched the powerband. I am still pulling at 6000 RPMs. Plus I have that true powerfull muscle car sound now. I had MBRPs which if you ask anyone, are probally the best sounding cat-back out there. But with no cats and true duals, the sound is on another level.
I have a dyno scheduled next month. I would have had one sooner, but the closest is 120 miles away!
2000 4.7 5- speed, 1989 Shelby #799 White
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wurley
Dodge Dakota
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1/23/2003
13:41:10
| RE: True Dual exhaust, Good or Bad
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I would go with 21/4 duals if your going to be keeping the engine pretty much stock. Even dual 21/4 will hurt low end some. Like cudashoe said, it will move power up in the power band. You'll get more hp and tq in the upper rpm's which will make you faster in the 1/4 mile. But in normal driving rpm's the truck will feel a little sluggish, but some don't notice it.
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Texas Todd
Dodge Dakota
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1/23/2003
14:34:26
| RE: True Dual exhaust, Good or Bad
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cuda, no HO, the cams only cost me $122, incl. shipping, installed at home. I'd like to see how all you have works with the cams, intake too for that matter. You could be pushing >275 HP at the crank!
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slow r/t man
Dodge Dakota
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1/23/2003
14:41:32
| RE: True Dual exhaust, Good or Bad
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I'd stick with the single 3" True duals with no cats would be to much flow. You want to keep a high velocity in the exhaust or you'll lose all your torque
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cudashoe
DakotaEnthusiast
1/23/2003
22:38:35
| RE: True Dual exhaust, Good or Bad
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There is no such thing as single 3" true duals.
The HO cams are in my garage. I want a set of chrome valve covers. thats why I havent installed them yet.
Yes I would say that I lost some low end torque, but I dropped my G-tech times by 8 tenths on the average!!!
2000 4.7 5- speed, 1989 Shelby #799 White
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4.7 Dakota
Dodge Dakota
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1/23/2003
22:46:19
| RE: True Dual exhaust, Good or Bad
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So far I have: intake, ported TB, 100 Shot, 4.10's with locking diff on a 9.25, and I'm planning on getting cams (HO, or KRC 206, any sugg.), HO Intake, then JBA headers, full 2 1/2 inch duals, no cats. Will it help me then??
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Waltherone
Dodge Dakota
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1/23/2003
23:05:06
| RE: True Dual exhaust, Good or Bad
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cuda, about where in the powerband is it now that you really feel the power pick up, if you are at say....half throttle or so (kinda agressive daily driving)? I'm tryin to decide between true duels or single, but I do a lot of traffic driving, don't want to loose TOO much low end.
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cudashoe
DakotaEnthusiast
1/24/2003
10:32:03
| RE: True Dual exhaust, Good or Bad
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Message:
The biggest gains were from 3000 rpms+. I still have plenty of power for traffic,
2000 4.7 5- speed, 1989 Shelby #799 White
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Texas Todd
Dodge Dakota
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1/24/2003
11:15:59
| RE: True Dual exhaust, Good or Bad
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'cuda,
why change magnesium Valve covers for chrome ones? I heard that the bigger rockers need a bigger cover. That why?
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cudashoe
DakotaEnthusiast
1/24/2003
14:07:55
| RE: True Dual exhaust, Good or Bad
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Message:
I am going to try and get some chrome-like finish on my extra set of stock valve covers
2000 4.7 5- speed, 1989 Shelby #799 White
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2THEXTRM
GenIII
1/24/2003
14:17:12
| RE: True Dual exhaust, Good or Bad
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Message:
I was wondering if anyone found a way to polish or paint their covers, the ugly cast look has got to go and noone makes aftermarket covers for the 4.7's.
Flowmaster cat back w/15 inch chrome tip, Volant Intake, Poweraid TB Spacer, Splitfire Plugs, full synthetic fluids
3 inch body/1.5 inch Block Lift, 305 70-16 X-Terrains on AR Terons, Pro Comp ES9000's
Grizzly double/single rollbar with (6) Hella's, Manik Nerfs, Line-X, Hard Work & $$$$$$$$$$
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