This little doohicky here gives the best performance/sound increase for the money, the exhaust cutout:

 

If you are looking for the most performance, you should go with this type of exhaust design:

 

If you like the dual outlet style and willing to give up a few ponies due to the backpressure this design creates, then this is your muffler:

 

My vote is single 3". Kind of a sleeper look but sounds and works awesome. I noticed about a tenth of a gain over the dual out.

(can you guys see this pic and my sig pic?)

 

Kandied.....I'd really like to see some numbers on the "proven" fact. I have no hard numbers of my own, and I'm not calling .....I would honestly like to see numbers for my own knowledge. I've read time and time again that the performance your talking about is the same kind of numbers as a TPI airfoil. Yes, it can be documented as a gain, but in the grand scheme, you'll never see it....on a stock engine that is.

 

Abubaca,

The straighter the airflow, the more velocity and more air will go out. Air does not like to make many turns. With the dual out type muffler, the exhaust has to go against the forward moving motion and then get forced into to one of two exits. This causes a lot of back pressure versus exhaust in and out.

 

I find it funny that the majority of people here would insult importers taste of "appearence over performance", but would pass out if they had single tailpipe on their car because it just wouldn't look as good. If you are going to run duals (yes, I am talking about true duals, not what most people here think are duals, twin tailpipes) then more power to you. I don't know how much power a cross-flow style muffler robs over an equevalent straight through one, but it is simple physics that the cross-flow just won't flow as much. If you are going to run single exhaust all the way up to the muffler then have two tailpipes that's fine, but keep in mind that you do not have duals. With all that said I chose a single tailpipe, although it is a hideaway one. I prefer the look, or lack of therefore, of this setup over the dual tailpipe setup (which I have owned and had on my car). C'mon guys is it that bad.....

Look how low the camera is to get the tailpipe.

 

My opinion...I really prefer no visable exits on thirdgens. Exhaust tips look unclean and interruptive of our bumper line. Echo tips look abnormally large and simply do not look good on lowered vehicles. Chrome does not fit on a thirdgen exterior. Rust or carbon soot aren't pretty either. The best option is a single hidden tip tucked just behind the bumper in such a way to still prevent fumes from entering the cabin. Check out mufflex's hidden 4" exhaust at www.mufflex-performance.com. That's what I chose to run, and it hides very well.

 

thats how sport coupes were stock. the pipes (one each side) were tucked way up into the bumper, facing down. no pipes were visable, you just got two plumes of condensation coming out from under the bumper.

that is how my s/c was untill it got its flowmaster

 

yup thats how mine is...

 

That's like mine too. In my opinion, the single out is the way to go. It DOES sound better, if hidden, it still looks good, and allows for a 3" in, 3" out muffler. I love mine.

 

I think I recall seeing a side exit single exhaust setup somewhere on this site. It was a nascar style exhaust exiting in front of the rear wheel on the pass. side I believe. Now that looked good. Not sure about ground clearance issues though.

 

hidden is good IMO.

looks better then some huge echo tips that are on trucks...

just giving ya a look at it kandied

 

I do like the look of the stock pipes on my iroc.(although they are the "dual" type...they're tucked away.

As far as crossflows not flowing as much, you are exactly right, but you miss the point. The issue was not which flows more, but which one performs better, or rather, which one performs better as part of a whole system. No one in there right mind will argue that a stock thirdgen exhaust flows well, because it doesn't. Either style muffler is more than capable of flowing just about enough exhaust....And the point is that while the single muffler is CAPABLE of flowing more, it isn't asked to because exhaust is bottlenecked everywhere else. It's kinda like saying that you should run a 5" exhaust tip, becuase it flows more than a 4". Well......it does flow more.....but we all know that's really not what is needed.

If you ask anyone what the first thirdgen mods should be....no one ever says adding a single muffler. Go to the track and watch how many cars, not just f-bods run crossflow muffs. Look how many hi-perf. catbacks have crossflow muffs. Look what 99% of all the top performers on this sight run...crossflow muffs.

We can argue all day long, but I'd hate to see newbies runnin' around thinking that they need a single tip muffler. Nothing short of real world HP #'s are gonna convince me otherwise...and if I someone can produce them...which no one will......I will gladly admit to being wrong.

Since this little side conversation is already of topic.....let's keep this friendly...no flames needed.

 

Oh yeah, here are my current tips. Stock.

 

nobody at my track runs a crossflow - everybody has got duals

 

Did you guys TOTALLY IGNORE what I wrote earlier?!?!?!?

Dynomax MAKES a crossflow that flows enough to support

427 LOSS FREE HP!!!!!!!

That means that a motor with 427HP will see no loss when this muffler is used. It does not mean that you'll never be able to make more HP than that.

That's A LOT more than 90% of the people on this site make.

And (as I've said already) WHO CARES WHAT YOUR EXHAUST TIPS LOOK LIKE WHEN YOU'RE PULLING SUB 13 SECOND ETs!?!?!?!

Granted...... they make singles that do flow more than that, but they're EXTREMELY LOUD mufflers. Not exactly legal on the street..... nor are they made to look good. They're made to FLOW!!!!

I'm not trying to flame anyone, but you can't say "it's a proven fact" if you don't show any proof. I'm showing proof of what can be done. I'm not saying crossflows are better than single pipe mufflers, or that they flow more. I'm just showing that you don't have to use a single pipe muffler to make good power.

 

well it is a proven fact all of which i don't have numbers readily available to discuss....frankly i don't truly care that most of you can't comprehend how there are advantages.

fact of the matter is simple; aftermarket exhaust companies build general pieces for general "street" applications. the guy next door looking for a little more tone and a little more flow. knowing full well that the true "racer" is probably out having something custom made.

while i agree that if your going to show exhaust tips a "dual" look is more pleasing to the eye. they simply don't perform as well as one with a single.

now obviously if you take a terribly designed single out muffler and put it up against a crossflow you will notice more gain with the crossflow, but when everything is equal the single out will always out perform.

as far as someone saying they never see anyone running at the track with single outs......while i find that hard to believe, that's fine. here in michigan you hardly see duals except on cars that are typically stock or don't know enough.

you guys can argue this topic up and down til your blue.....there is no point or reason as i'm not here to debate it. i simply wanted opinions on wether single or dual look is prefered.

if you want to know more about exhaust or what exact flow numbers do the research yourself......

 

Next time you go to the track, check out the stock/mild mod cars....NOT the race cars. Many will have crossflows. Not because they flow more CFM, but because at that level of engine mods, it's makes hardly any difference. Yes, at the higher performace end, you won't see them, I agree.

ahhhhh....forget it.

 

could you name some cat-backs for performance cars that come with a cross-flow muffler (besides for third gen and fourth gen fbods of course)?
and this site isnt the *** site of high performance cars. sure there are some fast folks here, and thats all fine and dandy, but there are a lot of fast cars dude. and i will go out on a limb and say that if it is easy to run duals on a car then somebody with performance in mind will run duals (and thus eliminating this discussion!).

but this is in the appearence board so this thread is obviously just about looks. so i wont talk performance anymore.......

looks are in the mind of the beholder, and to each their own....

 

Good point about the non-f-body cars running true duals

And you're right, this isn't really a tech forum.....so nuff said about this one. To each his own.

 

If you're really that concerned about it all....:hail: the Borla "dual" system. If you go to the track, run the passenger pipe all the way open - instant single pipe exhaust system, no mufler for backpressure. If you like the sound of crossflow, then run a different block-off plate. Best of both worlds if you ask me.....and let's not forget about the godlike borla square dual tips.

 

i think the pole pretty much explains preference, but me well i tucked my dual tail pipes as far up as they go, because well i hate tail pipes!

 

I would go with the dual as long as the exhuast system was a true dual exhaust setup...if it is really a single exhaust setup, don't split it at the end, just make it have a single pipe