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Double D
Dodge Dakota
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3/06/2002
15:02:18
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 Subject: Cut out exhaust
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I just put a home made air intake on my 4.7 and the power increase was amazing. I am looking for exhaust options but to put dual out is like $300. My buddy has a LS1 and he has a cut out on it it sounds good and gave him 18 rwhp. has anyone done this to a 4.7 dak?
'01 CC SLT
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LS1MoparTurbo
Dodge Dakota
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3/06/2002
15:19:54
|  RE: Cut out exhaust
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Do it. The best 50 bucks I ever spent. Why are you even F*cking around dude.
:)
Mike Friend
2001 Z-28 12.82 on street tires
1991 S-10 Blazer
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D Denney
Dodge Dakota
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3/07/2002
08:24:42
| RE: Cut out exhaust
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can someone elaborate on the cutout,what is it?
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LS1MoparTurbo
Dodge Dakota
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3/07/2002
09:40:44
| RE: Cut out exhaust
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It is basically a bypass for the muffler that can be capped when you want to make the truck quiet. When it is off you are just running through the manifolds, cats and some straight pipe. My brother-in-law has One on his Full Size Ram w/ a 318 and it sounds sweet. You will also net horse power gains. Most muffler shpps will install one for about 50 bucks.
Mike Friend
2001 Z-28
1991 S-10 Blazer
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Double D
Dodge Dakota
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3/07/2002
13:08:05
| RE: Cut out exhaust
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Hello has anyone done this to their dak?
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Dakota/cali
Dodge Dakota
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3/07/2002
13:39:45
| RE: Cut out exhaust
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From what I understand that is a bad option.4.7 needs back pressure!!!!What mods are done on the camaro my buddy has a 98 with just borla exhaust and shorty haeders and he ran 12.7 on street tires!Its an auto too!
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joel
Dodge Dakota
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3/07/2002
13:46:29
| RE: Cut out exhaust
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The LS1 is vastly different than the 4.7. On the ls1, where the cut out is determins where the extra hp is felt. If its under the back seat he will lose a little low end and gain on the top end. Sounds bad to the bone, like a race car. I had my cut out over the axle on my camaro SS because I didn't want to lose low end, wanted access to cap it (ended up never capping it!) and didn't want the major resonance in the cab.
Be careful when opening up the exhaust on your truck. When it comes from the factory, the exhaust is tuned to the engine, meaning it has x amount of backpressure.
When you open up the exhaust your relieving the back pressure. I suggest not touching the exhaust untill you get more air flowing into the engine or else it may mess up the power.
When you do have all your intake mods finished, I suggest a cut out over any cat back or muffler. You will save hundreds and it makes the engine sound like a real mans V8, especially the ls1 with a lopy cam :)
Joel
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LS1MoparTurbo
Dodge Dakota
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3/07/2002
15:08:56
|  RE: Cut out exhaust
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Actually I am quite impressed with the 4.7
I took a ride w/ Double D the other day and that was the first time he ever opened it up for me. It moves right along for being an auto N/A 4x4 truck. I am guessing mid to low 15 second 1/4 miles in the 80 to 90 mph range. Much better than any of the competitions light trucks IMO. Especially the Extreme and sure as hell much better than any V-TEC. Currently my Camaro has a Cutout and MTI free flow lid. 12.82 @ 111.45 on Street tires and 12.52 @ 112.34 mph on Nittos with 1.72 60 foot. I have Headers, 3.73s and M/T ET streets for this season. It is a 6 speed. I am hopping for low 12's high 11's. 2 weeks to the track opens. YEEAAAA!!
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kotaboy
Dodge Dakota
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3/07/2002
20:52:49
| RE: Cut out exhaust
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i put a cutout along with a gibson cat back on my 2000 cc 4.7, and it sounds awesome and performance is better. and as long as u still have a cat there is still plenty of backpressure.
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Double D
Dodge Dakota
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3/08/2002
10:21:41
| RE: Cut out exhaust
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Cool thanks man.
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johnc
GenIII
3/08/2002
10:36:53
| RE: Cut out exhaust
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Hey Kotaboy,
This cutout thing is beginning to interest me. Haven't even thought of one since, well, since a long time ago.
Anyway, where did you locate it on your exhaust??
Think I might have to try this.
Tx
'00',cc,4.7,4X4,auto,3.92sg
Flowmaster,Quickd Intake,
F&B 70mm tb,tstat,BFG's,
and a Bernd box
jc
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xplikt
Dodge Dakota
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3/08/2002
16:30:33
| RE: Cut out exhaust
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My 2002 4.7L is all stock but a single MBRP exhaust. Well, around the 2500+ range it's much faster in acceleration it seems, but under that it feels a big laggy now, I really need to pay my taxes to get an intake, high flow cat, etc...It's quick, but not the kick in the ass it used to have at 2000.
The MBRP deal was just too nice to pass up!
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gixsaar
DakotaEnthusiast
3/08/2002
17:14:03
| RE: Cut out exhaust
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Message:
I took the muffler and the pipe going out the back on my '01 4.7 and I like the sound a lot, not too loud. I just put a turn down tip on it and called it good for now, I reall want a true dual set up with some high flow cats and Spin tech mufflers though.
That would be sweet!
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Double D
Dodge Dakota
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3/11/2002
10:57:59
| RE: Cut out exhaust
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That would be sweet but to do true dual exhaust would cost an arm and a leg. which is why I asked about the cut out.
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dan
Dodge Dakota
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3/11/2002
21:03:22
|  RE: Cut out exhaust
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Found an exhaust off a '02 R/T, wanna put it on my 00' quad w/ 4.7, the muffler looks to be same size outside dimensions, any idea if muffler is the same or different sound wise? Hoping for a modest performance gain.
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circus boy
Dodge Dakota
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3/13/2002
18:39:52
| RE: Cut out exhaust
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i have 01 dak, 5 speed, reg. cab., 3.92, airaid intake, flowmaster dumped before axle, traction bars. i read this post and couldn't resist. i had a local muffler shop make me one. it was 60 bucks. i put it between the cat and muffler. i feel like i have lost power, but it sound awesome. it feels like my shift points are different too. not sure if i like it. any comments welcome.
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circus boy
Dodge Dakota
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3/13/2002
20:38:33
| RE: Cut out exhaust
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i'd like to retract that last statement. i just took a little ride with the cutout open. you can feel the power higher up in the rpm range. that's pretty sweet. maybe the supercharger is next. sorry if i discouraged anyone with my last post. i think the sound alone is worth 60 bucks.
any comments welcome
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Double D
Dodge Dakota
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3/15/2002
10:21:59
| RE: Cut out exhaust
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Thanks guys I appreciate all the info. I think I am going to talk my wife into letting me get the cut out this may.
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jontoad
Dodge Dakota
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3/16/2002
03:12:27
| RE: Cut out exhaust
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um.. you guys have your cut out in the wrong place. right off of your headers before the cat. if you dont put it there you are only bypassing the muff and that doesnt give you anything but sound. its meant for usage at the strip when you can use open headers. if you have it after the cat you better gut your cat to see full benifits. also you can get an electric opener so you dont have to crawl under the truck to uncap it. you can uncap it on the go from in the cab of the truck. it comes in handy when a ricer pulls up along side of you and revs at you. just flip a switch and make him deaf.
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2000 black dak R/T cc w/dual 11 inch silver stripes and chacers, lakewood traction bars, jet chip stage II (paper weight with ok shift points), jeds/bills old k$n, jeds/bills ported and polished TB, black outs, chrome 5.9 badges,hydraulic soft tonneau, white face gauges, mobil 1 through out, 2 bottles of mopar friction modifyer, and my favorite mod a sticker that says rice/terminator on my back window.
www.chicagolandrtclub.org (jon H.)
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LS1MoparTurbo
Dodge Dakota
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3/16/2002
13:52:01
| RE: Cut out exhaust
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Well on my 2001 Z-28 the Cutout is after the cats and before the Muffler. I gained 18 RWHP and 22 Ft/LBS of Torque. That is how a Boral Works. The adjustable plates are after the cats. How else would you explain the increase in H.P. and still be streetable. That is why exhaust are catbacks, The cut out helps reduce the pressure even if the cats are there. Espically on a dual to singal. I.E. a y-pipe with two cats into one bigger pipe. That is why after market exhaust are legal and a you still have a performance gain without effecting emission. On an LS1 or 4.7 cutouts before the cat would require two of them and would not help at all. The flow of the heads and intake would not be enough. If you are talking a 10 second car it may help that is because that motor has enough air coming in to benifit from two cutouts before the cats.
Mike Friend
2001 Z-28 12.82 at 111.45 MPH on street tires
MTI Air lid, Cutout. 12.52 at 112.04 on Nittos
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jontoad
Dodge Dakota
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3/16/2002
20:05:08
| RE: Cut out exhaust
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Message:
you put a y pipe into the cutout and then run it to the cat out the other end of the cutout. the sole purpose of a cut out is to bypass the exhaust system to give you better top end horsepower and flatten your torque curve. while still being able to cap it for everyday driving. i know of noone running a cutout after the cat on an r/t and i know of over 10 people on the national board who are running them before the cat and muff. i am picking up my headers tomorrow and i am putting my cutout before the cat. just think of it, that cat is robing horsepower thats y you gut cats or use highflow cats in the first place so dont gut it leave it and bypass it. i bet you money that if you put your cutout before the cat on your camero you would see better gains than 18. people on the national board are claming .3 in the 1/4 from cut outs alone. they leave the cutout closed for the launch because the backpressure of the stock system gives you more lowend torque then when they hit like 35mph they open it and get the high end horsepower.
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2000 black dak R/T cc w/dual 11 inch silver stripes and chacers, lakewood traction bars, jet chip stage II (paper weight with ok shift points), jeds/bills old k$n, jeds/bills ported and polished TB, black outs, chrome 5.9 badges,hydraulic soft tonneau, white face gauges, mobil 1 through out, 2 bottles of mopar friction modifyer, and my favorite mod a sticker that says rice/terminator on my back window.
www.chicagolandrtclub.org (jon H.)
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Joel
Dodge Dakota
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3/16/2002
20:38:50
| RE: Cut out exhaust
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A ls1 Camaro with just a couple bolt ons will dyno the same (plus or minus 2 hp) without the cat. So my point is the cat on the camaro isn't a restriction, its already high flow.
Joel
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LS1MoparTurbo
Dodge Dakota
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3/17/2002
02:04:13
| RE: Cut out exhaust
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A LS1 without the cats dynos much higher than one with the cats, go over to LS1.com or LS1tech.com and check it out. The cat Sure is a restriction.
My 98 Z-28 Dynoed 291 RWHP Stock. 301 RWHP with the Cutout throught the cats and 316 with the cutout and MTI Lid. With off road pipe and the same above it was 325 RWHP. So the 9 HP power came from removing the cats. My 2001 Z was 302 stock. Then with the cutout it was 318. Here is a link to that dyno sheet http://home.attbi.com/~mfriendz28/wsb/media/8251/site1019.gif With the cutout and MTI lid it was 330 RWHP and 352 FT/lbs of torque. So what you are saying is everyone is wasting money on any after market exhaust uless they want all show and no go right? Like Borla or Flowmaster. You will see horse power gains it might not be 18 like I did maybe only 5 to 10 but you will also see an increase in your gas mileage. Just out of curiostity has anyone here dyoned one of these trucks with the cutout capped and then uncapped.
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Double D
Dodge Dakota
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3/18/2002
13:02:11
| RE: Cut out exhaust
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I am going to get my cut out and go to get it dynoed. I have seen LS1 Mopar turbo's dyno sheets and I have ridden in the car with the cut out and with out there is a noticable gain in Hp. If you put the cutout before the cats you need to buy the sensors to fool the computer that way you don't get an emisions light. you also need some back presure for your low end power. when I get it done I will post my findings.
'01 CC SLT 4x4
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joel
Dodge Dakota
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3/18/2002
15:30:11
| RE: Cut out exhaust
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No, thats not what I said. Now you are putting words in my mouth.
You installed the Y pipe too so how can you have tested the difference of just removing the cats? The aftermarket Y's arent smashed on the drivers side.
BTW, I got this info from ls1.com. I've seen quite a few posts where there was marginal gains from removing the CAT (not the whole Y). But like I said, this is on a LS1 car with just a couple mods such as a lid, pully etc. A head/cam or FI car would have more gain.
Joel
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Bryan
Dodge Dakota
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3/18/2002
17:30:52
| RE: Cut out exhaust
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Double D,
What sensors are you talking about ? I am planning on installing cut outs on my 95 Dak.behind the manifolds and running the pipe just behind the front wheels comming into A 5" chrome elbow and running 5" chrome pipe down the side of the truck (like lake pipes on the old merc's)I don't need any emmisions light comming on.
Where would I get them, and how much?
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LS1MoparTurbo
Dodge Dakota
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3/18/2002
19:30:03
| RE: Cut out exhaust
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Message:
Correct me if I am wrong I am not sure about the trucks but the newer Mopar cars are just like the Camaro if you don't get the right exhaust gas as monitored by the O2 sensor your check engine light will come on. This will retard the timing in order to lower emissions, you know save a tree;). Happened in my 96 Stratus (stuck EGR valve)and my 98 Z-28 before I got the O2 sims. Maybe the truck doesn't monitor down stream of the cats for emissions purposes. If that is the case don't worry. Some one here would know that better.
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jontoad
Dodge Dakota
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3/20/2002
12:26:28
| RE: Cut out exhaust
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on our trucks the computer only needs to know that the second o2 sensor is cleaner than the first so take out the second o2 sensor and wrap it in heat resistant foam and tie it to the frame. problem fixed. o2 sim box is better though. get it at www.speedtweaks.net.
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2000 black dak R/T cc w/dual 11 inch silver stripes and chacers, gibson headers, lakewood traction bars, jet chip stage II (paper weight with ok shift points), jeds/bills old k$n, jeds/bills ported and polished TB, black outs, chrome 5.9 badges,hydraulic soft tonneau, white face gauges, mobil 1 through out, 2 bottles of mopar friction modifyer, and my favorite mod a sticker that says rice/terminator on my back window.
www.chicagolandrtclub.org (jon H.)
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joey macch
Dodge Dakota
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8/15/2002
21:22:03
| RE: Cut out exhaust
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your dodges suck
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PUNKHATER
Dodge Dakota
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8/15/2002
22:12:35
| RE: Cut out exhaust
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That's fine with us cuz YOU SWALLOW!!!!
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pat
Dodge Dakota
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9/09/2002
13:17:10
| RE: Cut out exhaust
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hey anyone know where you can get 3 inch cut outs and not 2 1/4". with the wire so you can open them manually? All i can find with the largest diameter is 2 1/4". help me out email me if you can thanks
pat
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