Dual pipe or single?

[Anonymous]

Hi, I've tried searching for this but haven't found any answers. It could be I'm looking for the wrong terms, so I apologize is this has been asked before.

I'm looking into starting my engine upgrade process with some of the classic inline exhaust headers. What I'm wondering is will I notice a difference in performance using the y pipe to feed into a single pipe vs installing a second?

I was thinking of going with a single in dual out muffler.

thanks in advance

 

[CobraSix]

I must ask. If you want dual exhaust, why not run it dual all the way back? Adding a Y pipe to go into 1 muffler to run into a dual out is going to look a bit odd. Also, from what I've seen, these cars don't have a good location for a single in-dual out muffler that will balance the exhaust flow on each exit pipe.

Personally, if you want dual exhaust, just run the 2 pipes with 2 generic 'turbo' mufflers. It isn't that much more expensive to do and worth it in the end IMO.

Performance wise, you probably won't be able to tell the difference either way.

 

[Anonymous]

Thanks for the info!

My thought was to take advantage of the existing pipe I have in place leading to the muffler, but I'm not married to the idea or anything.

 

[Bort62]

From a strictly performance standpoint, A Ypipe into a sufficiently large single exhaust will make no less power than dual exhaust and weigh less.

People will try to disagree with me, but they are wrong From a looks/sound POV, there are other valid opinions but I personally feel that inline engines with dual exhaust are gay.

 

[grocery getter]

From a strictly performance standpoint, A Ypipe into a sufficiently large single exhaust will make no less power than dual exhaust and weigh less.

People will try to disagree with me, but they are wrong From a looks/sound POV, there are other valid opinions but I personally feel that inline engines with dual exhaust are gay.

the rainbow wins on this one. if you're going with the dual headers, keep it a true dual. if it's a mustang you can get a cheap kit. you'll just have to modify the header to muffler piping.

keeping the stock pipe would kill any gain the header will give you.

 

[Anonymous]

Thanks. Sorry, guess I should have mentioned that its a 65 Mustang currently all stock.

 

[Patrick66]

i like the sound of dual exhaust, like grocery getter said you can get a fairly inexpensive kit for it to exit out the back. or you can just get some pipe and $20 turbo mufflers with turndowns and do it for really cheap. i agree with bort, performance increase over an appropriately sized single exhaust will be little to none (not worth it if performance is all your after, but it sounds good).[/i]

 

[BIGREDRASA]

I went with a single outlet chrome header, 2 1/4" pipe into a nice "quiet" short muffler in fron of the rear axle, and the tailpipe in stock location. I don't have dyno numbers, but my ears say it sounds sweet. Headers were $269, and exhaust was $170.

 

[ludwig]

I personally feel that inline engines with dual exhaust are gay.

Blithe and light-hearted?

 

[Bort62]

There is no performance advantage of a dual exhaust over a sufficiently large single exhaust.

And it weighs more, so it's actually a performance disadvantage.

Again, performance isn't everything - and that is where opinions come in.

My car has single exhaust like an inline engine should. So does my V8 camaro and so does the 650 HP Lt1 powered camaro of a friend of mine.

From a fluid-flow perspective (and yes, exhaust is a fluid) a single pipe is actually better than two pipes of equivilent area due to boundary layer effects.

 

[Anonymous]

Hi, I've tried searching for this but haven't found any answers. It could be I'm looking for the wrong terms, so I apologize is this has been asked before.

I'm looking into starting my engine upgrade process with some of the classic inline exhaust headers. What I'm wondering is will I notice a difference in performance using the y pipe to feed into a single pipe vs installing a second?

I was thinking of going with a single in dual out muffler.

thanks in advance

I run dual straight pipes on my 95 pick and it sounds good but man is it loud when you get into it. One of the pipes finally rusted through over the years so I had a single straight pipe put on the truck and holy cow its really loud. Good thing I live in the country. I have been thinking of putting some cheesy muffler on it to lower the sound just a bit. There was no change in the performance in the dual vs single that I could tell it is just loud as all heck.

 

[Anonymous]

Thanks for all the great feedback.

Ideally I'd like to eek as much performance out of the headers as possible while also having a little more "throaty" sound. Now if that can be obtained with a single pipe solution, I'm all for it.

 

[CobraSix]

From a strictly performance standpoint, A Ypipe into a sufficiently large single exhaust will make no less power than dual exhaust and weigh less.

People will try to disagree with me, but they are wrong From a looks/sound POV, there are other valid opinions but I personally feel that inline engines with dual exhaust are gay.

You should hear and see mine...definitely not gay! When I had the flowmasters...gay...with generic turbo mufflers...nice sounding.

 

[CobraSix]

My car has single exhaust like an inline engine should. So does my V8 camaro and so does the 650 HP Lt1 powered camaro of a friend of mine.

Why should an inline have a single exhaust? Many inlines out there (not modified inline 6's) have dual out exhausts, and not just dual out mufflers.

Sure, dual out is not real performance advantage over single...it's all visual. I'm a huge fan of dual exhausts...if only for the looks. Performance wise...sure, my car may have gained a whooping 10-15 lbs of metal and muffler...but that's small potatoes compared to the weight I've added with an 8" rear and and a T5 transmission.

Granted, if I was a true blue racer then maybe those 15 lbs would matter to me, but for a cruiser, nothing beats the look and sound of a properly set up and properly tuned dual system.

from a fluid flow perspective...yes and no. Sure, boundary layer has an effect...but larger systems allow for slower flow and allow for a little more cooling of the exhaust gases (due to lost pressure) which also reduce flow rate. It's all about balance. A well balanced dual out will perform as well as a single out. Singles are just cheaper usually.

 

[Bort62]

My car has single exhaust like an inline engine should. So does my V8 camaro and so does the 650 HP Lt1 powered camaro of a friend of mine.

Why should an inline have a single exhaust? Many inlines out there (not modified inline 6's) have dual out exhausts, and not just dual out mufflers.

If I said I had to run water from the street up to my house, and instead of running a single 2" pipe that I was going to run two 1.5" pipes right next to each other - you would look at me like I was retarded.

Same thing w/ an inline motor. Exhaust being generated at one physical location (passenger side of motor) and moved to one other physical location (atmosphere). Doing it with two seperate pipes is inane.

Like I said, it's opinion. You have your's and I have mine. That's fine. Btw, lower velocity flow is subject to less pressure drop. Regardless of the # of pipes, if the area is equal, the flow velocity will be equal anyway so it's moot.

The boundary layer effects are going to be so low anyway it's not going to matter.

 

[BIGREDRASA]

My 2 1/4" single looks "stock," and that's what I wanted. It only needs to please me. So the same should go for each of us.

 

[60s Refugee]

I'm doing the dual exhaust thing because I have a dual outlet header. By using the factory GT dual set up I have two 2" pipes going back to the turbo mufflers. I could have opted for 2 1/4" but I did the math and figured six cylinders dumping into pipes designed for eight would just about eleminate any back pressure. I fully expect to see an improvement over the stock transverse muffler single system, but that's where the coolness factor takes over. Maybe it won't flow any better than a big single system will, but in a 65 Mustang, duals running out through the rear valance is just about as cool as it gets. I ain't Don Garletts, but I certainly ain't gay either. Besides, how will I know? When she fires up next time it will be with all the tri power stuff, cam, head work, and the new exhaust too! It will go from "ho hum" to "WOW" all at once!

Besides, isn't the "H" pipe supposed to counter those flow issues?

Harry

 

[CobraSix]

Don't get me wrong...I fully understand and agree with your arguments. I am only stating that the effect of any of it is minimal for normal cars.

I went dual out for the look.

 

[Anonymous]

Don't get me wrong...I fully understand and agree with your arguments. I am only stating that the effect of any of it is minimal for normal cars.

I went dual out for the look.

I know this guy who has a four cylinder who ran four single exhaust out the rear. Now that was a odd sounding car. To each their own thing I guess.

 

[Patrick66]

To each their own thing I guess.

exactly, and please dont take it personal when somebody disagrees with you. its not worth it over an exhaust system.