Dakota Durango Forum banner

1 - 12 of 12 Posts

·
Registered
Joined
·
103 Posts
Discussion Starter #1
I am yet another concerned Dakota driver ('01 4.7 4X4 CC) who is looking to put on the true duals (side exit) on his truck. I have heard horror stories about losing low end torque and not having sufficient back pressure to operate well when true duals are put on. Could someone dispell this myth for me? I want the performance and sound (and look) of the duals, but I don't want to get smoked off the line by an Xtreme doing it...
 
S

·
Guest
Joined
·
0 Posts
Go with the GSMotorsport true dual setup. If you check out there web page they have a dyno page on there showing before and after. Usually you will lose low end torque by going with the duals. But what most people do is they go with too big of exhaust pipes. Our 4.7L's have a single 2.5" pipe stock... well lot of guys will go with 2.5" pipes or even 3" from the headers all the way back. This is what hurts... its too open. If you plan to do duals I wouldn't go bigger than dual 2.25" pipes. Rule of thumb: you don't need duals until you are running more than 400hp. I've seen 600hp motors running a single 3 inch exhaust and perform perfectly well. When I do mine I am going with just a single 3" pipe from the y-back. I'm like you I don't wanna lose the low end. Then again I plan to also get the KRC 206 camshafts for mine as well! Also if you haven't done it yet get you a cold air intake first before the pipes. This tends to compensate for the low end loss by bringing in more air for the motor to fart out.
 

·
Registered
Joined
·
103 Posts
Discussion Starter #3
I have a homebrew intake that is feeding the 4.7 with more than enough O2. The main motivation for the duals is that I have removed my 3rd cat and will have to pass inspection in August. I have two things I can do: put the original converter back on the truck and install a flowmaster or go all out on the duals. I want the end result to be a Dakota that sounds good, is dependable, and can light up the bow-ties.

As for the other mods, I am not comfortable installing my own cams, as I don't have the air tools, expertice, spare car, etc. etc. to do it. I am looking for a good engine shop to drop the install for me, but that also means I'll need more than a tax return to fund it. Most likely, I'll get the Hypertech when they come out with the programmer in May, see what the butt dyno says, and then decide on the cams.
 
S

·
Guest
Joined
·
0 Posts
I am anxiously waiting the hypertech as well. You can get the Mopar HO cams at the dealership and possibly have them installed there as well. That might be an option for you to check out. The Mopar HO's are comparative to the KRC 200's.

You can always go with the GSMotorsports true duals with the cats. Those are true high flow cats that replace all 3 of the stock ones. Plus you'll pass emissions with a true dual setup. All the setup will run approximately $800 after its allsaid and done. But you should be able to do this yourself. I want that setup but I can see to spend $800 on it. Looks and sounds awesome though. Would rather spend the xtra money on upgrading the motor some more. Then when I get new rims and lower the truck I'll put that exhaust setup on it.
 

·
Premium Member
Joined
·
1,544 Posts
I would NOT get the gsm true duals. They are a big waste of money for our 4.7's. AND SSRage was right... You truely don't need duals until you have a good 400 hp. You WILL lose low end tq. and you won't be happy with it. My friend Qwikkota in houston did a dyno with me standing right by him... only had 288 rwtq... which on his other run, he had 306 tq, with it just cut right after the y.

You will lose a lot of low end tq, and I'm sure you don't wanna do that. IF it was possible, I'd get true duals with 2 inch pipes.... but it wouldn't be smart, not to mention people asking you why.

I would go with getting a high flow cat... and a flowmaster with a single dump, and let it be until after you get inspected at least.

Paul
 

·
Registered
Joined
·
103 Posts
Discussion Starter #6
ordered

The true duals have been ordered. :woot: I got twice the return that I thought I was going to get and had a few $$ to put into the system. The muffler shop down the road wouldn't do the setup that I wanted, so I am going to do it myself with the GS Spintech system. I have 2 months until inspection time, so I should find a few hours to do the install.

This has been the first truck that I have been able to really work on and this seemed like fun. I am sure many (if not all) of you agree. There is nothing I enjoy more than a project done with my own two hands.

I talked to a few peeps on the phone about this setup and got nothing but rave reviews. YAAAABUDDY03's comment about losing low end torque was allayed by looking at the dyno sheets showing no torque was lost. I know it is contrary to the purpose of this site, but I am just going to have to see for myself (kinda like the autolites that people said wouldn't help, the homebrew that people said would melt, the 180* t-stat that people said would build carbon and not help much, or the removed third cat that would still pass inspection (HA!), etc. etc.).

In the end, if it sucks... I can just sell it on e-bay. I take that attitude with most of my purchases. I'll keep y'all updated.
 
S

·
Guest
Joined
·
0 Posts
(kinda like the autolites that people said wouldn't help, the homebrew that people said would melt, the 180* t-stat that people said would build carbon and not help much, or the removed third cat that would still pass inspection (HA!), etc. etc.).

In the end, if it sucks... I can just sell it on e-bay. I take that attitude with most of my purchases. I'll keep y'all updated.
LMAO!!! Thats the same thing I do to with eBay. The other stuff... Autolites in my truck burned out after 15k miles so bad, homebrew - nope bought a 360, 180º t-stat - I don't know what the hell they are talking about cuz mine's not and it does work great with a noticeable temp decrease, 3rd cat - no plasma cutter and too cheap to pay someone to do it... so True, Don't know, False, Don't know. Thats my answers. :D
 

·
Registered
Joined
·
103 Posts
Discussion Starter #8
PLASMA CUTTER?! HA!

A hack saw, trip to pep-boys, $10 worth of pipe and clamps, done. It took me 45 minutes, tops. It would have taken 15 if I had a saws-all...

As for the 180* t-stat, I had a little learning to do when it came to working on cooling systems. Turns out you have to put fluid back in the resivoir AND THE RADIATOR when you do this mod. Doh!

On another note, my idle has gotten a little less smooth... could it be the autolites? the jury is still out (as well as the order for my exhaust).
 
A

·
Guest
Joined
·
0 Posts
FWIW...I sold my Hypertech because it didnt do much for my ride and wasnt cheap at $300. After rave reviews, I am going to purchase a BG flash.
 

·
Premium Member
Joined
·
1,544 Posts
I didn't say it would make you lose low end tq. From what you have now. What I meant was... You can make it a LOT better! Meaning my friend had a good setup before he put the true duals on. The setup that he had was better than the true duals! I don't know if I can say it any other way. For the money... GSM is NOT worth it! Just my opinion.

Paul
 

·
Registered
Joined
·
103 Posts
Discussion Starter #11
Just finished the exhaust

Here goes...
I had been debating the whole exhaust thing since I got the truck last year... I even went to the extent of sawing off the main cat and straight piping it. Since it is about time for an inspection (which includes a emissions test), I decided to go all out.

I have a 4.7L 4X4 and had my GS Motorsports True Dual 2.5 inch exhaust put in on Monday. Let me say that it sounds AWESOME, has a noticeable power increase, and really changes the character of the whole truck to a more agressive tone.

I ordered it last month and took shipment early in May. I tried last Sunday to install it in my driveway, but I didn't have the right tools to detach the stock connections on the manifold. I went to my local "dashboard twenty" muffler shop, gave them the box full of pipes, and told them to make it happen.

Starting off, there were a few problems. The system that I got was not designed for a 4X4. The O2 sensors were in the wrong spots (hit the front drive shaft), the pipe from the driver side across to the passenger side where the Y pipe used to be wasn't long enough, the X pipe was wedged against the floor board, the pipes weren't long enough to meet the factory hangers, and the side outlet pipes were obstructed by the bolt holding on the leaf spring on the passenger side.

To fix this, it took a little welding, a bit of fabrication for the cross over pipe, a little bending of the hangers, and turning the bolt around on the leaf spring. To say the least, it WAS NOT bolt on.

Everything was going fine on Tuesday, but after I got a few miles on it last night, the check engine light came on. I did a little research and the O2 sensor is detecting that one of the cats is not doing it's job. I don't know if this is a function of the factory cats, the O2 sensor location, or the instillation, but I can just cover the light up with some electricians tape.

I don't need a light to tell me I have a bad a$$ exhaust.

In closing, to purchase the exhaust was a little pricey. To have it installed was more expensive. To drive around, setting off alarms and turning heads is priceless. If you don't have a 4X4, go for this one. It is worth every cent.

I notice that there ISN'T a loss of low end torque. The low end torque just isn't as improved as the mid and high end power. Overall a good change, but a bad expierence. GS Motorsports was 100% helpful and understanding on all of this and was a saving grace mid-install when we were panicing.
 

·
Registered
Joined
·
12 Posts
I have the Gibson stainless dual exhaust. They sound great, and I cannot detect any loss of torque... seems to have more plus better high RPM power. Now I can light up the tires from a stop. Only down side is the spare no longer fits. Next I'm looking to mod the intake, just waiting for some $$$. I like the 360EZ...they use K&N filters.
 
1 - 12 of 12 Posts
Top