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Ian
Dodge Dakota
JOIN HERE
11/16/2002
19:53:37
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 Subject: any hp gain from muffler swap on 4.7?
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Message:
Is there any hp to be gained by swapping out the factory muffler on the 4.7 with a hi-flow one? Obvioulsy a hi-flow would sound better but the only way I could justify spending more money is if a got some gain, has anyone dynoed after only a muffler swap (I already know dynos on the cat backs are showing a loss in torque that's why I'm asking bout just the muffler)?
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handi2
GenIII
11/16/2002
22:13:06
|  RE: any hp gain from muffler swap on 4.7?
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Message:
Probably not enough for the trouble or expense. You definately wouldn't feel any difference.
2002 Quad Cab SLT Plus 4.7 Every Available Option
Bed Rug/Access Tonnoue Cover/Roadmaster Suspension/HO Cams
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dr0p0ff
DakotaEnthusiast
11/17/2002
00:44:27
| RE: any hp gain from muffler swap on 4.7?
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Message:
not until that cat get's outta the way
Keep On Truckin!
Sgt G
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BlackDak20
Dodge Dakota
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11/17/2002
02:11:54
| RE: any hp gain from muffler swap on 4.7?
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Message:
I have a 02 quad cab w/ the 4.7 and i put dual exahust after the cat. I put on the flowmaster 3 chamber. I didnt notice so much change in high end, but my truck had alot more acceleration after I put the flows on. I mostly did it for the sound. But over all I did notice a gain in acceleration and there is probly a top speed gain too but those stupid governors. I need a programer to get rid of that thing. Ha Ha
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notchlx
Dodge Dakota
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11/17/2002
03:23:31
| RE: any hp gain from muffler swap on 4.7?
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Message:
Put a Flowbastard on the 2000 4.7. Didn't notice anything.
Pulled 201RWHP & 273RWTQ with just that mod.
That's right on with factory at the crank with the 5-spd (235)
Sounds a heck of a lot better.
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CThomp
Dodge Dakota
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11/18/2002
08:35:41
| RE: any hp gain from muffler swap on 4.7?
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Message:
You have to do the cat as well. I put on a carsound cat and will hopefully be putting on my magnaflow muffler when I have the time. It's a 2.5" in/out stainless. It's supposed to be the one of the better performers on the market. And the quieter. I'm not into loud.
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hh
Dodge Dakota
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11/18/2002
10:39:15
| RE: any hp gain from muffler swap on 4.7?
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I put a Flowmaster 70 (the 22" long one) behind the cat, with 2 1/2" pipes and stainless slash cut tips exiting behind the rear wheels like the R/T single. No noticable floorboard noise. Sounds great and pulls strong. 4.7 5-speed 2001.
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Terry Duncan
Dodge Dakota
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1/22/2003
16:00:58
|  RE: any hp gain from muffler swap on 4.7?
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Message:
I installed the Flowmaster 40 series with 2 1/4 outlets behind each wheel. It sounds great but I think I lost some low end torque which is likely because of less back pressure.My Dakota is a 2000 4.7 . How can I regain the lost torque without changing cams,etc. ? Thanks
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Demon-Xanth
Dodge Dakota
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1/22/2003
16:16:14
| RE: any hp gain from muffler swap on 4.7?
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I put a Dynomax on mine, and I think I lost a little bit. But it sounds alot better though. Has less of a whooshy noise and more of a rumble. Not really loud either.
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The Dude
Dodge Dakota
JOIN HERE
1/22/2003
16:28:30
|  RE: any hp gain from muffler swap on 4.7?
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Message:
I have a Ravin on my QC 4.7 and I lost just a touch of low end. Got it back and then some with the H.O. cams I had put in today, though.
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Terry D.
Dodge Dakota
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1/22/2003
17:55:51
| RE: any hp gain from muffler swap on 4.7?
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Message:
Just hard much is involved in changing over to the HO cams? Thanks
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02GraphiteDak
Dodge Dakota
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1/22/2003
18:05:39
| RE: any hp gain from muffler swap on 4.7?
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Message:
If you are looking for some noise just go get a straight pipe made. I bought a lifetime Dynomax and an extention for $100. It didn't give me enough noise so I bought a $10 straight pipe, Sounds tough, I love it. Good Luck
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The Dude
Dodge Dakota
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1/22/2003
18:12:39
| RE: any hp gain from muffler swap on 4.7?
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Message:
Well, the H.O. cams involved me going to the dealer and having them installed. Up to the challenge, I was not.
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Ace
Dodge Dakota
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1/23/2003
14:48:19
| RE: any hp gain from muffler swap on 4.7?
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Message:
Hey "The Dude" How do you like the Ravin Exhaust?? I was think about getting one of those?? Plus how much did the HO Cams run you??
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Guest
Dodge Dakota
JOIN HERE
1/28/2003
14:00:45
|  RE: any hp gain from muffler swap on 4.7?
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Message:
I did a Borla 2.5" in/out in a 4.7L durango with the factory pipes, to me it made a big difference in performance and sound. I have hit the 115 speed limiter a couple of times and it just wants to continue accelerating.
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illusionist
Dodge Dakota
JOIN HERE
1/28/2003
15:09:19
|  RE: any hp gain from muffler swap on 4.7?
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Message:
LOL- gains from a single to dual cat back on a 4.7!-LOL
Ever notice-
The but dynomometer is directly proportional to the money you spent on a dyno proven basically worthless mod?
2-3 hundered dollar cat back, and oh yea, I really noticed a difference in accelleration, and top end!
I applaud those of you how have admitted minor losses in low end, and only gains in the tympanic membrane!(ear drum)
Get a life people!
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ShortSport
GenIII
1/28/2003
21:46:43
| RE: any hp gain from muffler swap on 4.7?
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Message:
hey illusionist personal results may vary.....telling people to get a life is ignorant......so how about an illusion and disappear..
2002 Reg cab 4x2 4.7 5-spd 3.55.1 LSD
fiberglass tonneau cover; stainless steel cat-back dual exhaust; magnaflow muffler
Go hard or go home!!
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Zekester
Dodge Dakota
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1/31/2003
20:13:04
| RE: any hp gain from muffler swap on 4.7?
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Message:
Yea,
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The Dude
Dodge Dakota
JOIN HERE
1/31/2003
23:16:18
| RE: any hp gain from muffler swap on 4.7?
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Message:
The Ravin exhaust is great. I'm very pleased with it. The H.O. cams were $140 each.
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Pittdawg
Dodge Dakota
JOIN HERE
2/09/2003
21:18:30
| RE: any hp gain from muffler swap on 4.7?
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Message:
so what's the conclusion, a new muffler buys you better sound and loses low end torque? That sure sounds pretty crappy to me!
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Jimmyg41
Dodge Dakota
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2/10/2003
23:44:39
| RE: any hp gain from muffler swap on 4.7?
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Message:
Does anyone have part numbers for Flowmaster, Magnaflow, or Dynomax mufflers? My dad has a 4.7 QB and I want to get him something so his truck sounds mean. He's mentioned a couple of times that that is what he wants. I just want to get the muffler because I can't afford the catback...semi-broke college student
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CThomps
Dodge Dakota
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2/11/2003
08:05:23
| RE: any hp gain from muffler swap on 4.7?
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Message:
I have a magnaflow #14256. It's a S.S. 2.5" in/out straight through design. It bolts directly in place of your stock muffler. Cost me $100 from truckperformance.com. Made a nice sound improvement. Not to loud at all except for when I get on it. It made a decent improvement in acceleration quality. By this I mean acceleration became much smoother and i'm pretty positive a little faster. Open up your intake as well otherwwise you won't feel the full benefit.
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