I am thinking about putting dual exhaust on my X and I was wondering if u all get better gas mileage and more hp by doing so? Thanks

I was thinking about doing the same thing when i did mine, and a flowmaster rep said there is no difference in HP. Whether i believed him or not, i just kept it as single. I thought it might be overkill with 4L anyway. If you have V-8 it might be a different story.

hmm.. really.. i gotta v8 and i got dual exhaust.. i noticed the difference.. but i dunno if theres a big difference from aftermarket single to dual?

Yeah...I really wanna do it for better gas mileage...I think with dual exhaust the engine will be able to breath easier so it would probably increase hp a little too...not sure though...and I wanna make it sound a little mean too :D

If it is true dual, you will notice a differace.
Meaning, two pipes, two muffelers, two, converters, the two never touch. With out question there WILL be a differance.

Any variation from that and the best I can give you is possibly.

I'd think any improvements in fuel economy with a dual exhaust would be canceled by the extra weight.

i have 98/302 with dual exhaust but you need to make sure you have a cross over somewhere in the exhaust...."true dual" will hurtt fuel economy and power....if you run two seperate pipes that never touch you with mess up the exhaust pulse patern....its hard to explain, but look at all good exhaust for all performance cars like mustang, they have "h" pipes or "x" pipes to link the two sides of the exhausts for a balanced exhaust pulse, like i said its hard to explain on here but it is needed to help the engine perform better...... i dont have any cats on my x so i linked the two where the two cats used to be but if you are going to keep the cats then link the two pipes just after the cats and before the mufflers.....it will really help your x to breath better but you need to help the intake breath as well, so get a good air cleaner at least....good luck and sorry this was so long....

what are some good dual exhaust kits out there? i kno gibson makes a couple.. are those any good? or a custom flowmasters?

Originally posted by MONMIX
If it is true dual, you will notice a differace.
Meaning, two pipes, two muffelers, two, converters, the two never touch. With out question there WILL be a differance.

Any variation from that and the best I can give you is possibly.

How does the Flowmaster 50 SUV muffler sound? What I mean is, does it have that deep throat sound to it?

Michael

When you say pipes, are you talking about just the exhaust pipes or the pipes going into the muffler from the engine as well? I am trying to decide what setup I want to get for my X, a dual or single out.

I have noticed on the JC Whitney site that there are 15 different combinations of in/outlets. Which is the most popular and does it really make any difference?

Like I said, Im still trying to decide I want to do and just trying to get different opinions and thoughts.

Also, for those that have the duals or single straight out the back, did you have to remove the spare tire from under the truck for the pipes to fit properly?

Thanks for the info.

Does your 94 have a y pipe that links both through a single cat? If so it would probably breathe just as well if you put a larger diameter pipe out the back.
Also bear in mind that an exhaust that has little or no back pressure will lose torques and increase horsepower.
I know mine has two cats side by side w/ two separate exhaust pipes. I was going to go dual in/dual out muffler or dual in 3 in out.

You drive 4k lbs truck, gas mileage will be bad no matter what.

Originally posted by mdriggan
How does the Flowmaster 50 SUV muffler sound? What I mean is, does it have that deep throat sound to it?

Michael

I dont know how 50 SUV sounds, but the delta flow has a decent rumble. The guy who did mine said he couldnt get 2 & 1/2" pipe over the axle, so he had to use 2 1/4 then back to 2 1/2 for tail pipe.(?????) Anyway, it still sounds pretty good.

98svt is right about crossover tube. I used to have a 390 mach 1 with true duals, and it actually made it a little quiter, or should i say less loud.

I have a single SUV 50, not dual.
Any way. It is no louder than stock at idle but it does sound better.
It has a real nice tone from 2,500 rpm to 3,500 rpm.
It is never overbearing, which is what I was after personally. You stomp on it and it does holler a good bit. Not too much. Just right lets say.
It's loud when you want it to be loud. Not when you don't.
It was just what I was after.

Originally posted by MONMIX
I have a single SUV 50, not dual.
Any way. It is no louder than stock at idle but it does sound better.
It has a real nice tone from 2,500 rpm to 3,500 rpm.
It is never overbearing, which is what I was after personally. You stomp on it and it does holler a good bit. Not too much. Just right lets say.
It's loud when you want it to be loud. Not when you don't.
It was just what I was after.

Does your single pipe come straight out or follow the stock pipe route?

It is dual in, single out and it follows the exact path the factory pipes did, straight out the right rear.

Actually i noticed a good difference in going from stock to true dual exhaust. The only thing that the "X" or "H" does is to prevent backfiring when decellerating(that is what my exhaust guy toldme and he is well known for doing EVERYBODIES custom exhaust setups around here. But i havent had the backfiring problem or the fluttering problem either.. I would still say that in my opinion even true dual is going to be a sweet deal. Whether the pressure equals itself out at the tailpipes or before the mufflers either way each engine bank operates on its own exhaust system for a while till it hits the "Y" like in the stockers setup. Heck i think i will just go with a big 393 stroker with a YS trim blower and straight headers to the sides. lol. now that would be one mean truck. Too bad i dont have the money to front the $20,000 additional to do that. though it would be cool.

I have a flowmaster series with a single in dual out setup, it's decently louder on startup and at idle than stock, and I notice a distinct difference throughout the whole powerband- especially at full throttle. It's not too loud inside, but it's loud enough outside for anyone to realize it isnt stock... I personally wouldn't go any louder... also a lot of people I know think the tone sounds ballsy...

Hope this helps out

For you guys with true dual exhaust, how did they route the pipe around the spare tire and exit the truck on the left side? I think I am going to go with a 50 series SUV, dual in dual out. Will this act as an X pipe or will I still need to put an X pipe in somewhere? TIA...

I have a flowmaster 70 series, stock pipes, no resonator and a dual out pilot tip. ther eis no way someone can confuse this setup for stock even though its the quietest model they make. nice mellow tone and not overbearing, not even on the highway. i'm satisfied. all i plan on doing is getting a custom 2.5" tailpipe following the stock route.

Regarding "X pipes", "H pipes" and crossovers...

What SVT was relating to when he refered to "pulses" is the scavenging effect that takes place in any exhaust system with more than one cylinder feeding it.

Acceleration of exhaust gas created by pressure drop.

Kinda like NASCAR drivers drafting each other.

Since your cylinders don't all fire at once but rather one after another, each "pulse" has another "pulse" behind it in the system. That forward "pulse" will actually pull the second pulse with it, hence "scavenging".
Or think of it as one cylinder exhaust pulse SUCKING the pulse behind it, out of the tail pipe.

Look at high performance motorcycle engine exhausts... 4 into one is always the way to go for big torque.
I found this out a long time ago with changing factory Harley exhausts and then seeing dyno numbers go down.

Sooooo..........

Dual is cool but better to crossover to suck dem pulses out!

Originally posted by VairKing
For you guys with true dual exhaust, how did they route the pipe around the spare tire and exit the truck on the left side? I think I am going to go with a 50 series SUV, dual in dual out. Will this act as an X pipe or will I still need to put an X pipe in somewhere? TIA...
That is the same setup I have. That muffler is dual in, then goes to 3", then through the muffler, back to 3", then dual out. It will do the same thing as an X pipe.

Originally posted by mdriggan
How does the Flowmaster 50 SUV muffler sound? What I mean is, does it have that deep throat sound to it?
I have the same engine as you with that muffler. HERE (http://www.e-techcorp.net/images/Exhaust.wmv) is a clip of my exhaust just reving. HERE (http://web.ics.purdue.edu/~choisw/vids/98FordX24_drive100.wmv) is one of me driving and HERE (http://web.ics.purdue.edu/~choisw/vids/98FordX24_drive101.wmv) is another. The first one is messed up in the beginning and it was raining when we did it so there's a lot of road noise. Hope this helps you guys.

I'm pretty happy with my Borla system...not too loud, but loud enough for a v8. If i remember correctly, i paid close to $900 for it installed.

http://www.msucycle.com/~bmacd/vids/explorer.jpg

-=bmacd=-

Originally posted by bmacd
I'm pretty happy with my Borla system...not too loud, but loud enough for a v8. If i remember correctly, i paid close to $900 for it installed.
-=bmacd=-

Dude sorry to tell you but unless that included some inexpensive headers or something then you got ripped. Dont mean to be annoying by saying that but what exactly did they do for your exhaust? Sizes, cats, mufflers, specs how many??? Maybe that can help me understand why it cost so much if there is something else included with your exhaust that you forgot to tell.

Originally posted by rocket 5979
Dude sorry to tell you but unless that included some inexpensive headers or something then you got ripped. Dont mean to be annoying by saying that but what exactly did they do for your exhaust? Sizes, cats, mufflers, specs how many??? Maybe that can help me understand why it cost so much if there is something else included with your exhaust that you forgot to tell.

Not really sure to be honest with you...my uncle had it done. My uncle had it done right before i bought the truck from him and he told me that he spent close to $900 on the full system.

-=bmacd=-

If you ever do plan on going with some other mods later. Just to give you advice i would say to find the specs out for your stuff, that way you can see how well it will flow if you ever decide to put any serious stuff under your hood. But if you basically plan on running it stock then just disregard what i just said and keep hearing the sound of power coming from under your hood. :D