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| Best performance exhaust, single or dual? https://slantsix.org/forum/viewtopic.php?t=38116 |
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| Author: | 63GTRAG [ Fri Nov 27, 2009 8:39 pm ] |
| Post subject: | Best performance exhaust, single or dual? |
There must have been some good discussion somewhere on exhaust, can someone point me in the right direction? |
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| Author: | ceej [ Fri Nov 27, 2009 9:07 pm ] |
| Post subject: | |
Dual flows more, but weighs more as well. Single will dry out faster. Single tends to sing up top, dual has more of a hot rod sound at lower revs. I like my cars quiet, and prefer to purchase the exhaust once. Single for me. To each their own! I'd search for the threads for you, but I'm feeling really lazy after all the leftovers!  Your on your own Hoss!  CJ |
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| Author: | DusterIdiot [ Fri Nov 27, 2009 9:25 pm ] |
| Post subject: | Limits... |
I have true duals with turbo mufflers and it's got a rap to it, but a nice "english" I-6 sound in the 2500 rpm+ range (after 4000 you sound like a Honda that got a pair...)...LOL... There is a limitation with the earlier bodies, especially if you have a manual tranny, it's a bit tight when getting the exhaust down under the car...I've seen a few examples where most people prefer to run duals to a collector to a 3", run that under the car, then branch out again to duals for the look (cleaner than running a coffee can 3" Honda Muffler...). All of CJ's observations are correct, and there are a few other things you can do if you are looking for quiet in duals, with muffler choices and having your exit exhaust be smaller than the feeder pipes (i.e. dual 2" to muffler then exit 1 7/8"-Dan's Recipe. It works.). Good luck on choosing your exhaust, -D.Idiot |
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| Author: | SlantSixDan [ Fri Nov 27, 2009 9:29 pm ] |
| Post subject: | |
The question can't be answered helpfully without more complete information on what you're trying to accomplish. What kind of car are you working on -- year and model? What is the engine configuration with respect to carburetor and intake, camshaft, ignition? Standard or automatic trans? Rear axle ratio? Is it a daily driver, a racecar, a parts-hauler truck, or something else? What climate do you live in? Does the car have to pass any emission tests? If so, what kind? |
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| Author: | madmax/6 [ Fri Nov 27, 2009 10:13 pm ] |
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Bigger single in my opinion,have tried both,Guzzi Mark |
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| Author: | Wesola78 [ Sat Nov 28, 2009 2:01 pm ] |
| Post subject: | |
I have Dutra Duals on my Volare. I was planning on dual pipes out the back, but I decided on just a single pipe that is 2 & 1/2" in diameter. Dual pipes look and sound cool, and there is something to be said for that, but on my almost stock slant six, it's overkill. Plus, its extra weight. Now, all of this is just my two cents. To each his own... 
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| Author: | Reed [ Sat Nov 28, 2009 2:25 pm ] |
| Post subject: | |
For practicality and longevity, I like dual exhaust manifolds on a slant but single exhaust. Splitting the exhaust manifold can help prevent the cracking that sometimes occurs fore or aft of the "tower" on the exhaust manifold due to its length. However, for the above mentioned weight savings and simplicity of installation, a split manifold set going into a properly sized single exhaust pipe is fine. 2 1/4 or 2 1/2 inch diameter should be fine for a daily driver or mildly warmed up motor. |
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| Author: | SwingerPerry [ Sat Nov 28, 2009 7:52 pm ] |
| Post subject: | |
I like a large single myself.... although with a high-flow muffler, your car may just sound like an airplane like mine does at higher rpm's. (Just read the above comment: I agree... I am wanting to switch to a split exaust manifold yet into a single large 2 1/4" pipe.) |
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| Author: | vynn3 [ Sun Nov 29, 2009 11:20 am ] |
| Post subject: | |
Quote: I like a large single myself.... although with a high-flow muffler, your car may just sound like an airplane like mine does at higher rpm's.
The same is true with duals and high flow mufflers...Me like! |
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| Author: | 63GTRAG [ Sun Nov 29, 2009 1:37 pm ] |
| Post subject: | |
The vehicle is a 63 Dart with an auto and 3.23 rear. Engine is .60 over with head milled .035, 53.2 cc. 270 cam, 1.77 intake 1.44 exhaust with a little pocket porting, balanced. Clifford Hyper-Pak with a 390 Holley and Clifford dual headers. I live on a mile and a half of dirt road in north Idaho where it gets very cold and nasty in the winter. I will only be driving the car in the summertime. (not a daily driver) I did find a thread where people we're discussing drone, I definitely want the car as quiet as I can yet as much performance as I can milk from the exhaust. Tim |
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| Author: | Reed [ Sun Nov 29, 2009 1:40 pm ] |
| Post subject: | |
Then go for a dual exhaust manifold, keeping the stock rear section, run a single 2.5 inch exhaust pipe all the way back and get a Walker Quiet Flow muffler for your car. |
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