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Discussion Starter #1
Ok, so, as of right now I have replaced the stock muffler with a nice Thrush free flow muffler and removed the resonator, and it sounds great, but I want a deeper tone and a little more noise. My plan was to do up a nice dual exhaust to get more noise, but I was wondering if upping the diameter of the pipes by 1/2" would create an issue with back pressure. I like the sound I have now but I want louder and, more importantly, deeper sound. Has anyone ever rigged up a dual exhaust on this vehicle before? I looked at it when I had it up on my lift at work and it is definitely doable, but I would end up removing the spare tire to do it, which I am ok with, lol.
 

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2006 Kia Sorento 3.5 5sp Auto
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do want dual for the look, or for what you believe would be a better sound?
If sounds, run dual right next to each other. Can get 2 in 2 out muffler.
If you plan on going in water crossings, that is when the bigger diameter pipes will be a problem.
The extra 1/2 inch wont be a huge issue with back pressure unless you start really giving it stick and keeping the revs up for a long period of time (race track style). I believe its only an issue in that instance coz the quick on/off full throttle applications causing the air to change directions very quickly.

When i was looking for exhaust, these are the basic principles i learnt. (not for the kia btw)
more noise = more free flowing, less restrictions. (cat, mufflers, resonators)
deeper noise, play around with different muffler/cat combinations as they a tuned for the noise they make. Different packing (inside the muffler) too possibly.

So louder, hiflow cat (you havent said you changed the cat)
deeper, muffler...
 

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I now drive a 2003 S-10 Had an 03 LX 3.5 Sorento
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Also remember there are three cats. One out of each exhaust manifold and one pre muffler. If you attempt true dual exhaust you will need the extra cat pre muffler and a cross over tube. Some states don't allow the exhaust to be modified pre cat for emissions reasons. I don't know about your state but you might check it out.
 

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NS, you sure that 3rd one is a cat?
Dont mean to get into an argument, just for my knowledge.
Its just i have never seen/heard of two cats in series. There is two cats, one out of each bank, but i would think that other thing would be either a resonator or another muffler.

In terms of the cross over, i have had it, and i never really liked it. If i were to do it again, i would have gone h pipe or twin straight through with no cross section.
That was on a bmw 4.4 v8. i got a pulsating sound coming from the exhaust, and this why i wouldn't go x pipe again on that car.
In saying that i guess you have to understand the firing order of the 'V' engine your going to be putting the exhaust onto to understand if your going to be getting a pulsating sound or not.
 

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Discussion Starter #5
do want dual for the look, or for what you believe would be a better sound?
If sounds, run dual right next to each other. Can get 2 in 2 out muffler.
If you plan on going in water crossings, that is when the bigger diameter pipes will be a problem.
The extra 1/2 inch wont be a huge issue with back pressure unless you start really giving it stick and keeping the revs up for a long period of time (race track style). I believe its only an issue in that instance coz the quick on/off full throttle applications causing the air to change directions very quickly.

When i was looking for exhaust, these are the basic principles i learnt. (not for the kia btw)
more noise = more free flowing, less restrictions. (cat, mufflers, resonators)
deeper noise, play around with different muffler/cat combinations as they a tuned for the noise they make. Different packing (inside the muffler) too possibly.

So louder, hiflow cat (you havent said you changed the cat)
deeper, muffler...
As of right now I don't plan on going through water or anything, just beating around town. I still have plans for a lift and tires before I go out off road. The sound I am looking for is purely aesthetic, for me. The muffler I have on right now sounds nice and low and throaty when I'm idling around the parking lot or at cruising speed, but when I stomp on the throttle, it starts to sound like a low pitched rice burner exhaust. I am ok with this, but I would rather have something deeper more throaty. As for the cats, I can only recall seeing the two right after each manifold, and then the muffler, followed by the resonator at the end, which I removed.

Can you get high flow cats for this car? Or can I use a universal high flow? I think I will go with that and then run 1/2" bigger dual pipes.

What would be the main difference between a dual in/dual out muffler and running two mufflers?
 

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When I took mine off it looks like a cat inside. I know there aren't any sensors.I took it off to see if I got any better milleage and I have never been able to fill it up twice in a row.
 

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1995 Procharged Mustang Cobra, 2021 Sportage EX
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NS, you sure that 3rd one is a cat?
Dont mean to get into an argument, just for my knowledge.
Its just i have never seen/heard of two cats in series. There is two cats, one out of each bank, but i would think that other thing would be either a resonator or another muffler.

In terms of the cross over, i have had it, and i never really liked it. If i were to do it again, i would have gone h pipe or twin straight through with no cross section.
That was on a bmw 4.4 v8. i got a pulsating sound coming from the exhaust, and this why i wouldn't go x pipe again on that car.
In saying that i guess you have to understand the firing order of the 'V' engine your going to be putting the exhaust onto to understand if your going to be getting a pulsating sound or not.



The 3rd one is a cat if it's a USA model. Don't know anything about Kia's in other contry's.
 

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Firstly you mentioned you do plan to go off road.
If you plan to go through water, big exhausts are not so great (depends how deep you are willing to go into water), and there is not enough exhaust pressure to keep the water out. So keep that in mind.
Personally, i would keep the same size, and just look at high flow with that in mind.

Cats - universal, just high flow. Come in all shapes and sizes.
If you go dual pipes, and they are both 1/2" larger than the current single pipe, that is a huge difference.

Dual in - dual out - saves space more than anything. Depending on the brand and the design, would depend on the sound it produces.

In terms of sound your after - talk to a exhaust specialist in your area, and listen to what they say. The will most likely recommend a product or two, and its hard to say what it will sounds like, but i guess you tube around for that.
I would also talk to a 4wd specialist (the exhaust guy may know?) about the size side of things and in terms of back pressure and water.

I had to cross a big puddle of water in my last car - BMW 740 4.4, with bigger exhaust and full high flow.
I kept on the brakes, and kept the foot down to produce as much back pressure as possible while going through slowly. (btw the tips of the exhaust were hidden, and pointed down) As the exhaust was bigger, not enough back pressure water got into the whole exhaust and the car was sputtering until all the water evaporated out the exhaust. So i would b every weary and keep in mind where you plan to take the car. For me its more about practicality than looks/sounds - but that will be a balance that you can decide and your plans for the car.
 
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