boostmotorsport

Nobody talks smack about my single titanium HKS! It will rumble your heart in your chest, and with the custom 3" piping the whole deal cost under 500$ and flows like a ****!

jspecracer7

I HATE DUAL EXHAUST

NZConvertible

Um, what are you talking about? Fake? Have you ever even looked at one? They are completely functional!

Funklord

i'm very torn
i like the look of dual exhaust, and i like things that perform well but look and sound stock, thats why i like the RB duals.
i also like things that are cheap, and perform. thats why i like the CS single.

you could get into the rice factor.. the CS is a big, loud, attention grabbing muffler, but the RB has one more muffler than a single turbo FC needs. an extra muffler just for looks. but then again, thats how FC's are from the factory.

NZConvertible

Lots of opinion in this thread, not a lot of fact...
It doesn't matter what the car, or how many turbos it's got; there are very good engineering reasons for running two parallel mufflers on a street car, and it's not just for looks.

kabooski

I bet you NZ my Single 4" Ultra-Flow straight from Turbo Back
Will Out Flow "ANY" Duel system you can come up with

and of course Duel looks better
yet does not perform as well as a Single Exhuast(minimal bends) on a Turbo GT Rex


and I would choose the Racing Beat Exhaust
It is almost near stock sounding
yet improves performance

If you do not want a loud exhaust

RarestRX

Yo,


*chuckle* Yeah, all those Mazda engineers don't know much about rotary exhaust flow. They just put dual exhaust on the FC for kicks, spending all that extra money per car for fun. *cough* Okaaay...

But seriously, if you guys want to join the legions of annoyingly loud, single canister imports out there...feel free.

I think the dual exhaust sets the FC apart from all the typical imports out there. Most importantly, it definitely sets it apart from the 944. I dig mine:





Oh, and have you noticed the RX-8? Dual exhaust. Corvette Z06? Dual. Porsche 911? Dual. Honda S2000? Dual. Ferrari 550? Dual. I like being in that kind of company.

KS
1989 GTUs "Waiting for the JIC titanium.../dual/ exhaust."

2ndGen.rocket

TRUE DUAL EXHAUST. running back from 2 separate headers through 2 separate pipes back to 2 separate mufflers. The Rx-7 is pointless in this way, because it is one pipe running back from the manifold, which hits a Y-pipe that separates to 2 canisters. It is purely for looks, and anyone that contests by saying that dual flows better than single, I would love to see some proof on that one.


And by the way, as for joining legions of loud, the Rx-7 has its very own exhaust note, like nothing anyone has ever heard.

steelec

You know the stock mufflers are stainless and last a pretty long time. After you remove your cats (or at least front cat and get a free flow main cat) the car has pretty good flow with the stock cat back. Of course if you want that slight horse power bump its worth it. Someone said large dia exhaust actually hurts your speed off the line (before the turbo spools). Just stating what I heard.

RarestRX

Yo,


Obviously you don't know much about auto manufacturers. If they could have saved money by using a single...they would have. How much do you think all that extra piping and muffler /costs/? If it truly was "pointless" it wouldn't be on the vehicle.

I don't doubt a single flows more than a dual, but with that extra flow you get...increased noise.

Oh people have heard that same sound that comes from a single FC 4" tip: a 2 stroke chainsaw.

*chuckle*

KS
1989 GTUs "Brrraaaaaahhhhhppppppp....."

kabooski

Oh Oh sorry Rarest
But I don't use those sucki *** Jap mufflers
that have 4" Tips but the inner tubing of the muffler is 2.5"

I use The Best of the Best "Ultra-Flow" 4" all the way inside and out

vosko

iTrader: (4)

i LOVE how my n1 single sounds. NO CHAINSAW here. here is a vid clip. its sounds amazing

http://67.83.39.159:8080/media/t2burnout.avi

2ndGen.rocket

chainsaw???? HAHA

that was funny. And yes the duals did serve a purpose...LOOKS. The whole setup is cosmetic. If it wasnt, then why was there never dual exhaust on FB's or FD's? You may be able to argue noise reduction, but there are certainly single exhaust systems that are just as quiet as that dual was. It is cosmetic, yes just like someone converting a Dodge Neon to dual exhaust. One pipe off the manifold coming to a Y-pipe. Gay, and not very functional. If you look at that Y-pipe itself, you can see that it is totally a restriction to flow. right at the flange where it meets the cat, it has to split off into 2 sections and at that point there is a little wall. im not gonna explain cause its annoying and confusing but anyways, single is better looking, sounding, and performing. just go for it.

NZConvertible

You have a 4" exhaust system? Seriously? This I have to see! Please post pics.

NZConvertible

The FB was a much cheaper car, and no one ever said dual was cheap. The FD was all about packaging. Ever looked under the *** of one? Very tight. And if it’s just looks, why do the Cosmo and RX-8 have them? Have you seen the size of those cans? The simple fact is that two free-flowing mufflers in parallel can muffle as well as a single highly baffled (restrictive) muffler, but guess which flows better? Both pipes flow equally, so it’s completely functional. And I’m not sure how sexual orientation relates to exhaust. Please explain... You’re talking about the stock system, which nobody here cares about. A well-made Y is does not create much turbulence, and is not as restrictive as you seem to think. Exactly. If you don’t fully understand something and find it confusing, you shouldn’t try to state your opinions as fact. Learn a bit more about exhaust design before you go off.

2ndGen.rocket

im arguuing that the setup of dual exhaust on an FC was more cosmetic than anything else. thats about it. anyone else agree?

RarestRX

Yo,


I don't it's about looks. I think it's about higher flow, heat and noise reduction. Again, I would give those Mazda engineers some credit. Not to mention the beancounters, no /way/ would the second muffler be on the car if it didn't serve a functional purpose.

Vosko, you have a turbo to baffle some of the noise of the rotary, a single canister NA FC sounds like...a chainsaw. To me, it doesn't sound "good" it sounds like a fartcan equipped Civic. But again, that's just my opinion.

My other point is...how many front engine, rear drive Japanese cars have dual exhaust? Other than the recently introduced S2000? Just the 300Z came to my mind. Any others? I couldn't think of any.

So having dual exhaust on a Japanese FR is very unique. And having a rotary is even more unique. Why would you take away some of the uniqueness of your RX-7 to make it like 99% of the other imports running around on the street?

KS
1989 GTUs "Dual Rule!"

NZConvertible

Off the top of my head...

The ones you’d know:
Mazda RX-8
Honda S2000
Honda Accord (V6)
Lexus GS400 (Toyota Aristo in Japan)

The ones you might not know (JDM):
Mazda Cosmo (JC)
Toyota Sprinter/Levin/Corolla GT (20V)

I think the 300ZX was twin all the way back, none of the above are. I know some are FWD too, but that doesn’t really matter.

Ziggy682

Do you have the Dynomax Ultra-Flow??? I have been wanting to run one of those on my 86 N/A. I went to the muffler shop the other day, and the owner told me the muffler won't hold up to the rotary temperatures. I told him I was pretty sure they would, but he told me they wouldn't.

How does your setup sound? Is it very loud? Any other info?

kabooski

Well on a NA I don't know how well it will hold
up
But on My Turbo
It is LOUD when under WOT
but regulaer driving it's quite good
Has it blow out since I had it? (6 months)
Nope..even when my car uses no CATS

My friend has a N1 single with no cats either
and my muffler pumps out more air then his

you can stand 3 feet back and you will feel the air hitting your leg (idleing)

-----------------------------------------------------------------------
read a good hands on article
http://home.earthlink.net/~tmahon281/image.html

best snipet from site::::::::::::

OK; I can hear you saying, "How can an Ultraflow muffler beat a straight 3" pipe"? This welded Ultraflow (as opposed to the seamed SS Ultraflows) has a HUGE *4"* PIPE running through it; only the entrance and exit is 3". The 4" pipe with smooth drilled holes in it flows better than a 3". This is the only muffler I've ever tested that has a shot at REDUCING the back pressure that you get with NO muffler at all, and it actually quiets the car down more than my two 3" Race Magnum Bullet mufflers (which offer MORE restriction)!! "
-----------------------------------------------------------------------

But in the future
I might take out my Ultra and put it on as a mid pipe
and go with a SS Magna-Flow for looks
and to quite it down some

NZConvertible

I wouldn’t get too exited about those test results. A well made straight through muffler should have barely any more pressure drop than a piece of straight pipe, because as far as the gases are concerned, that’s all it is; a straight piece of perforated pipe.
The Warlock and Flow Master mufflers in those tests are baffled type mufflers so of course they’re going to flow like **** compared to a straight through design.
The reality is that a very short length of 4” pipe in a 3” system is going to make very little difference in power, if any. You’re only talking about 5-10% of the length of the system.
So going back to your comment “I bet you NZ my single 4" Ultra-Flow straight from turbo back will out flow "any" duel system you can come up with”, I highly doubt it. I think you’ve been sucked in by the marketing.
And remember, this discussion is about pipe configuration, not muffler type. If you can stick in one Ultra-Flow, I can stick in two. My arguments for dual pipes still stand.

BLUE TII

iTrader: (9)

I think that dual muffler exhaust is a great way to keep it quiet and look good doing it! That said, when it comes to all out performance on a TURBO car a BIG single is the way to go. How many of the Japanese tuner FCs do you see w/ dual exhaust? I haven't seen any.
I bought a used RE Amemiya turbo back dual from RotaryXecrets first because I loved the looks and it could flow more than enough, but when it was "destroyed in shipping" I bought the JIC Magic Spec 90 (3 1/2") single from Rishie. We turbo FC guys are pretty limited in the super high flow systems we can buy. And a custom SS mandrel bent turbo back exhaust is really going to cost us :-(
I like dual, but if I can't get looks and ultimate performance I will settle for ultimate performance!

Piranha

I like the look of dual, but I could only afford a single (N1). So I have a single now

NZConvertible

Sorry to generalise, but there's that American off-the-shelf attitude again. You can have any exhaust you want by buying the muffler(s) of your choice and having the rest custom-made. Pick any pipe size and configuration you want. And there seem to be plenty of large diameter exhaust systems and components out there; how much freer-flowing do you want?
Besides, you are not limited at all. If you want limited, come and see what we can buy off-the-shelf. Why SS? There're only two advantages; longevity and looks. A system made from aluminised mild steel painted with a quality high-temp paint should last many years before it rusts out, and who here would keep an exhaust that long, let alone a whole car! As for looks, it's under the car! Apart from the fact it'll be covered in road grime in under a week, it's barely seen.
Sorry for the rant...

Thaniel

Difference in sound? Yes I would expect. RB offers a non turbo version. A turbo muffler on a N/A is much LOUDER. Got to make sure you know what you are wanting. Do you want loud? You ever plan to drive this baby accross the country (without ear plugs) or is it just a racer for the weekend. My .02