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RS
Dodge Dakota
1/05/2002
20:34:05
|
 Subject: 4.7 No muffler?
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Message:
I Just bought a 2002 4.7/5sp/3.55 4X4. I traded in a 99 318 ram which was straight piped after the cat I like the very loud and deep rumble that truck had. I purchased a flowmaster 40 series but I have a feeling it will not be as loud as I'd like it to be, My question is as anyone tried a 4.7 with no muffler? If so how was the sound? also would this reduce back pressure on a 4.7? Thanks for any input.
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CW
GenIII
1/05/2002
20:39:05
|  RE: 4.7 No muffler?
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Just about guarenteed that you will lose power if all you do is swap the muffler out. I am pretty sure that mine is a 40 series and it is very quiet. I am getting rid of the third cat soon and hope it will help the engine breath and sound better.
2001 RC 4.7 5sp 9.25" 3.92 LSD
Ported throttle body, IAT adjuster, 3" flowmaster cat back, TPS @ .76V, 4" cold air, roadmaster active suspention
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D
Dodge Dakota
1/05/2002
21:50:55
|  RE: 4.7 No muffler?
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Message:
dude, I just cut off my flowmaster 2 chamber
(soon to be on Ebay) and switched to the
Dynomax Ultra flow race muffler, its a straight
through design (6" round and 20" long) and
sounds killer! I switched the pipe to 3"
catback and added a Megs 4" cone shaped tip
to the end...It sounds beasty, and if I get rolled
by the Police, I'll pass visual, at least. No
muffler is ticket time, I dont care what you
drive.
FINALLY, MY 4.7 SOUNDS LIKE A V8!!!!!!!!
D
01/4.7/CC/3.55auto/airaid/poweraid/JetStageII
UltraFlow/DJMdrop3/6/pegleg :(
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RS
Dodge Dakota
1/06/2002
16:36:44
| RE: 4.7 No muffler?
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Message:
D
Did you notice any low end power loss? I want it to be loud but I don't want to loss any grunt off the line, Please let me know how your truck responded,and I take it that a single 3" pipe after the cat?
Thanks
Ryan
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D
Dodge Dakota
1/06/2002
20:34:48
| RE: 4.7 No muffler?
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Message:
no power loss, in fact, I feel more power/better
response. I havent ever had it on a dyno, but I
drive it every day, I would notice a power loss.
yes, 3" after cat.
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kicker01
Dodge Dakota
1/07/2002
22:30:56
| RE: 4.7 No muffler?
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Message:
I got full 3" single in dual out exhaust that starts at the y -pipe and goes to a flowmaster 40 series muffler which is then a dual 3" out to the sideswept 3" chrome tips. Let me tell ya, it sounds mean and loud. Taking the 3rd cat out makes all the difference in the world. It pulls harder at launches and it pulls harder at higher speed than it did before. I dont think i would like the sound of a non-mufflered exhaust.
01 RC 4.7 5spd
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RS
Dodge Dakota
1/07/2002
22:41:22
| RE: 4.7 No muffler?
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Message:
Kicker how are you getting around the third cat? I imagine sooner or later your gonna have a problem with the other two. I was told this will burn out the other 2 down the road. Just what I heard don't know if it's true.
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NeedForSpeed
Dodge Dakota
1/07/2002
23:47:41
| RE: 4.7 No muffler?
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Message:
Hey D, do the Dynomax come in single in dual out?
I went to their website and all they got is single in single out.
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D
Dodge Dakota
JOIN HERE
1/08/2002
02:52:43
| RE: 4.7 No muffler?
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Message:
single in/out only, I heard the single in/dual out
makes you lose power...not sure though. I
think only true dual exhaust adds more power
I guess true dual is with an H-pipe and dual
exhuast back. That would be a dope setup,
headers, h-pipe, two utlra flow race mufflers,
and 3" pipe all the way through. I guess If I
lived outside of California, It would be
possible, damn those emissions!
www.jegs.com/cgi-bin/ncommerce3/ProductD
isplay?prrfnbr=5314&prmenbr=76&lastcat=
if you can manage to post that link, Jegs has
the dynomax race welded muffler, 6" round at
$59.99....well worth the money, and the guys
at my muffler shop said that they sell them for
$120.00 !!!!!! good luck!
D
01/4.7/CC3.55auto/airaid/dynomax/TBspacer/
JetStage2/DJMdrop3/6/pegleg :(
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pat
Dodge Dakota
JOIN HERE
1/13/2002
13:43:45
| RE: 4.7 No muffler?
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Message:
i chopped my muffler off my 4.7. didnt like the sound after shifts it kind of sputtered real hillbilly sounding i put a 40 series flowmaster on it it definitly made it quieter but it still sounds mean. i would put the muffler on and a set of headers and no convertor it will be loud trust me
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D
Dodge Dakota
JOIN HERE
1/08/2002
09:42:21
| RE: 4.7 No muffler?
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I wish i could chop off the 3rd cat...Cali sucks!
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conig
Dodge Dakota
JOIN HERE
1/08/2002
16:17:01
| RE: 4.7 No muffler?
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how are ya'll getting your cats chopped off I can't find a shop willing to get rid of mine even when I offer to sign a waver of some kind.
I too am egar to here what a dak would sound like with straight pipes
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kicker01
Dodge Dakota
JOIN HERE
1/08/2002
18:29:30
| RE: 4.7 No muffler?
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Message:
RS, how would cutting the 3rd cat burn up the two precats? I imagine the only effect to the precats would be increased exhaust flow through them.
conig, you just have to know the right people or shop that can hook you up. In my case i just got lucky with knowing a guy that knew the owner of a shop that would do it.
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Rs
Dodge Dakota
JOIN HERE
1/08/2002
20:44:29
| RE: 4.7 No muffler?
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Kicker1
I had a 99 ram with a 318 that I ran straight piped after the cat, 3 months after doing this my cat pretty much melted. I was told that when I chopped of the muffler it displaced the back pressure directly on the whole cat. The cat's are designed to be the hottest as the enterance where exhaust gas come's in it is then cleaned and cooled as it get's to the back of the cat. Hopefully the cat's are better than they were on the 99 ram's as they did have a recall on them anyway, but I still was told this could cause failure anyway. This was told to me by a Chrysler engineer. I don't know how it would apply to a 3 cat system . If what I was told is in fact true I imagine it could happen in this situation to.
Ryan
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CW
GenIII
1/08/2002
20:55:55
| RE: 4.7 No muffler?
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Recall on the 99 ram ummm... I must have missed that one but I don't think so. No recall on that one.
2001 RC 4.7 5sp 9.25" 3.92 LSD
Ported throttle body, IAT adjuster, 3" flowmaster cat back, TPS @ .76V, 4" cold air, roadmaster active suspention
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RS
Dodge Dakota
JOIN HERE
1/08/2002
21:36:30
| RE: 4.7 No muffler?
IP: Logged
Message:
CW
It might have been a Technical Service Bulletin but either way there is a problem there because it was replaced FREE by a dealer under a recall as I was told.
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D
Dodge Dakota
JOIN HERE
1/08/2002
23:45:18
| RE: 4.7 No muffler?
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I've heard those quick a$$ 4.6L mustangs
have 6 cats. How come they sound so good
anyways???? Is it cause they have a DOHC
motor instead of a SOHC?
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Clevite 77
Dodge Dakota
JOIN HERE
1/08/2002
23:55:23
| RE: 4.7 No muffler?
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Actually the gt's have a sohc but the cobras have the dohc's
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D
Dodge Dakota
JOIN HERE
1/09/2002
01:19:09
| RE: 4.7 No muffler?
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why do they sound so much better then
(GT's)?
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Clevite 77
Dodge Dakota
JOIN HERE
1/09/2002
09:38:26
| RE: 4.7 No muffler?
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The exhaust might be bigger in diameter, I'm sure duals help, maybe the tips are bigger. As you can see I'm just guessing on these.
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conig
Dodge Dakota
JOIN HERE
1/09/2002
13:48:26
| RE: 4.7 No muffler?
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two cats on a mustang 4.6L 00 anyway my bro had one
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D
Dodge Dakota
JOIN HERE
1/10/2002
00:36:50
| RE: 4.7 No muffler?
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maybe thats why they sound better...I need to
lose my third cat to be as cool as a stang(ha
ha ha ha)
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Jake
Dodge Dakota
JOIN HERE
1/10/2002
13:30:04
| RE: 4.7 No muffler?
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If i change the tip on my 2k1 stock exhaust with 40 series flowmaster, will i loose any power just from the tip, and if not what is the biggest tip i can get that won't kill back pressure??? thanks
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jeff
Dodge Dakota
JOIN HERE
1/10/2002
16:32:35
| RE: 4.7 No muffler?
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you guys must have to much money to spend.2 weeks after getting my 02" 4.7 3.92 4x4 i went to the parts store paid $20 for a thrush glass pack, 30 min. latter still using the factory clamps and tailpipe (which i might take off) my truck sounds great!
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Travis
Dodge Dakota
JOIN HERE
1/11/2002
11:11:24
| RE: 4.7 No muffler?
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Message:
Hey Jeff, where did you get you Thrush Glass Pack? Did you have to beat the heck out of you muffler to get it off the pipe, since the clamps kind of crimped the pipe on the muffler. I am going to try that this weekend, was out looking at the truck after reading your post last night.
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robert
Dodge Dakota
JOIN HERE
1/12/2002
17:24:01
| RE: 4.7 No muffler?
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I put the thrush glass pack on my 4.7 too. Beating on the muffler only resulted in the loss of a hammer. I ended up cutting two slits on the pipe of the muffler(with a dremmel and a cuting wheel) and peeling it back. The butt dyno tells me that i may have lost a little but the sound makes up for it.
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dak
Dodge Dakota
JOIN HERE
1/12/2002
23:41:10
| RE: 4.7 No muffler?
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I put a turbo muff. on my 4.7,All the service guys at the local dealership say it sounds great,Buuttt,If I knew of a way to make it like a mustang I'd change it in a heart beat..
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Travis
Dodge Dakota
JOIN HERE
1/13/2002
00:33:13
| RE: 4.7 No muffler?
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Message:
Well I just spent 5 to 6 hours putting on the glass pack that cost $19.99. It was a real pain, but my truck sounds awsome, it is loud and deep. I went to Schucks with no muffler after I got it off. No muffler after the cats is way to loud, and really does not sound good. But the money for the glass pack and the two clamps that I broke was well worth the money, so are the busted nuckles and sore hands.
00,4.7,Auto,4X4,CC,SLT
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jeff
Dodge Dakota
JOIN HERE
1/13/2002
13:46:32
| RE: 4.7 No muffler?
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Message:
take off the old clamps then use an air chisel to get the muffler off. Start at the back of of the muffler so that you can remove the tail pipe, then you can remove the muffler the same way. I ground slots onto the glass pack so that it would slide into the posts on the original pipes. The only modification I had to do was to bend one of the hanger brackets ( the one near the back) so that the tail pipe wasnt so close to the body. You wont think its all that loud at first, but give it some time, the packing takes some time to burn in and the noise will gradualy get better.
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Jason
Dodge Dakota
JOIN HERE
1/14/2002
00:04:58
| RE: 4.7 No muffler?
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I have a 2000 Dakota 4.7 RC 5-spd 3:92. It's bone-stock, with the exception of a 40 series Flowmaster after-cat, with 2-1/2" dumped.
Ran it at Engineered Performance on the Dyno Saturday......
201RWHP
273RWTQ
The barometer sucked, temperature was good though... Not too bad for STOCK...
Figure in your 17% drive-train loss and your right on the money, 235HP the torque was awesome.
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TODD
Dodge Dakota
JOIN HERE
1/15/2002
09:43:35
| RE: 4.7 No muffler?
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TRAVES I DID THE SAME THING 19.95 GLASSPACKS
IT SOUND GRATE I LOVE IT.
I HAD A SHOP DO IT FOR 15.00 BUCKS.
IT TOOK ABOUT 10 MIN. TO DO 5.9 QC SPORT PLUS
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Travis
Dodge Dakota
JOIN HERE
1/15/2002
14:24:33
| RE: 4.7 No muffler?
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For the money I could not beat it for now. I will one day pay the couple hundred for a nice 3" system, but I am happy for now.
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conig
Dodge Dakota
JOIN HERE
1/17/2002
15:33:21
| RE: 4.7 No muffler?
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be very carful when you buy a glasspack most glasspacks have a 2inch or 1and7/8 ind core. that is a verybad bottleneck/transition to have in the exhaust system.
if you go glasspack get one like thishttp://www.jcwhitney.com/product.jhtml;$sessionid$O0ZYIPQAAAL4HWBBLJTSFE4YEFNGMIV0?CATID=5446&BQ=jcw2
2.5 in 2.5 out 2.5 inch core essentailly a race/ultraflow/bullet muffler but without the highquality sound packing.
just out of curiosity isn't THRUSH a division of WALKER/DYNOMAX(same thing) exhaust?
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jeff
Dodge Dakota
JOIN HERE
1/17/2002
16:31:31
| RE: 4.7 No muffler?
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yea, I think it is. the one I used is was what we call the cherry bomb because of the color.
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surferpug
Dodge Dakota
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1/17/2002
21:52:08
| RE: 4.7 No muffler?
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Hey CW or Duner, I hear you guys are running a high-flow 3" cat. What size is your muffler? I'm running a 2.5" muffler should i run a 2.5" cat or a 3" cat?
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D
Dodge Dakota
JOIN HERE
1/17/2002
21:55:10
| RE: 4.7 No muffler?
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I believe CW posted on another thread that he
cut off the third cat (and believe me, its a cat,
not a resonator!)
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CW
GenIII
1/17/2002
23:26:41
| RE: 4.7 No muffler?
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Message:
Duner is running the 3" exhaust for his turbo application with a single 3" high flow cat. I have those pesky precats. What I did was cut the exhaust at the Y-pipe and got ride of the third cat and put in a flowmaster cat back that I had off of my '97 dakota. Getting rid of that third cat was the best single mod so far. No torque loss and a pretty good gain at 5000+ sounds better than just the cat back alone. I am running 2 frac&12" exhaust and a 3" tail pipe because that is what the cat back came with. A very win win situation IMO.
2001 RC 4.7 5sp 9.25" 3.92 LSD
Ported throttle body, IAT adjuster, 3" flowmaster cat back, TPS @ .76V, 4" cold air, Roadmaster active suspention, Removed Third cat.
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CW
GenIII
1/17/2002
23:28:23
| RE: 4.7 No muffler?
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Message:
That is 2 ½" exhaust. Damn HTML code.
2001 RC 4.7 5sp 9.25" 3.92 LSD
Ported throttle body, IAT adjuster, 3" flowmaster cat back, TPS @ .76V, 4" cold air, Roadmaster active suspention, Removed Third cat.
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2THEXTRM
GenIII
1/18/2002
03:07:07
| RE: 4.7 No muffler?
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CW, any numbers for mpg figured yet? Just wonderin if your mpg dropped with 3rd cat chopped.
Flowmaster stainless cat back, Air Raid CAD and homemade TB connect, Poweraid TB Spacer, Splitfire Plugs
3 inch body and 1.5" block lift, 33x11.50-16's, Superlift Truspeed Recalibrator
Powerslot Rotors, Ceramic Brake Pads
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CW
GenIII
1/18/2002
09:30:34
| RE: 4.7 No muffler?
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No idea I just did it monday but I will be gone this weekendand put on about 300 miles. We will see then.
2001 RC 4.7 5sp 9.25" 3.92 LSD
Ported throttle body, IAT adjuster, 3" flowmaster cat back, TPS @ .76V, 4" cold air, Roadmaster active suspention, Removed Third cat.
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Dakota Cowboy
Dodge Dakota
JOIN HERE
1/21/2002
19:28:36
|  RE: 4.7 No muffler?
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I have a 93 c.c. 4x4 318 with dual straight pipes off the original cat. I did the exhaust on my buddies Q.C. 4.7 all stock except for pipe replacing the muffler. They sound Identical use larger tailpipes to make it sound throatier. Sounds good either way.
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