K!NCH

iTrader: (2)

How is exiting out the drivers side JDM? Oh and single FTW!

FC_boi

I always love the looks of single exhaust maybe im just used to it...well its just my opinion.. im planning on doing a single exhaust on mine and im planning to buy like a apex WS2( painted flat black) or maybe an apex NOIR.. something that is ovaled and flat black and those exhaust are quiet too..

MazterDizazter

iTrader: (5)

You mean racers? I'm keeping mine single people; every ounce counts in my race car. You peeps with street driven 7's can do whatever you want...

Roen

iTrader: (2)

single on the street = ricers
single on the track = racers

t24todd

iTrader: (7)

^thats going to confuse so many idiots...all ricers think there racers in the first place...make it easy for them and tell them duals

MazdalicousRx7

i personally think that single or dual is just a state of mind and how people seem too picture it. people call single ricer just because thats what they like doing, and the fact that a dual on a honda would look ****** weird! but some people do like single and like the look of it instead of dual. i believe if you like go for its not guarenteed that everyone is going to like it. everyone is going to be a critic its just how people are. i run a single out the driver side because its what i like more then dual. of course dual gives you more flow for better top end power, but i like torque, and a 2.25" single straight pipes gives me just enough that i want.

i think starting this thread was a very bad idea since everyone has their own opinion. and people tend to get burnt really easily.

MazdalicousRx7

FYI in my opinion i think a ricer is a Honda painted some bright color slammed to the grounded running blanks, with quicker flashing blinkers, chrome tail lights, and a huge pointless spoiler. and a ricer is a state of mind, someone that thinks their something and says they are when their really not.

Valkyrie

I personally think single exits look cool... as long as you have a sport-type canister muffler with a reasonably large round tip (it would look retarded if you were using stockish mufflers like the one I have on my car...).

And you're saving anywhere from 15 to 30 pounds (or more) depending on the size and material of the dual muffler versus the single...

30 pounds at a national level stock-class autocross is a HUGE deal (you can replace the catback but you can't even cut off the useless stock tie-down hook on a Miata).

Wh1t3 C0m3t

what if its a street car that sees a good bit of track time?

na5

i switched my dual setup for my na to a single rb muffler and i noticed an improvement over stock in low end torque and its not too loud

Roen

iTrader: (2)

Hmm...that's a good point, though if it's a street car, I would think duals would be the way to go. It all comes down to two things. The first is that the RX-7 is made for duals, so having an empty bumper cutout looks weird. The only way a single would be acceptable to me on the street, is if the cutout modified to look whole again. The second is noise. Singles make more noise for a given power level. I have a personal preference to make my car civil for the street. I could really care less about my track car.

If you have a National level-car, chances are that it doesn't see much street duty. (I'm think SP classes and above). In that case, noise level doesn't really matter as much and single would be fine. However, if your car splits groceries and autox'ing duties, you should go dual for common courtesy. No one really wants to hear your car buzzing from 2 miles away, well no one but you.

Valkyrie

Stock class has nationals too. Obviously stock cars see a lot of street duty, as they're, well, stock.

There's also no rule that says single exit exhausts have to be loud (esp. with removable silencers).

dial8

iTrader: (4)

I love my APEX dual but, BUT i still like the Motoria single I sourced a few years back. If your car sees the track, do what i do, swap exhausts and replace the gaskets.

Roen

iTrader: (2)

right, but silencers limit flow and power. I'm not the biggest fan of them, though i see the benefit. Civility when you want it, power when you need it. I'd still rather have the full-time power that I have with the civility due to the dual design.

I mentioned prepared classes. stock and touring classes can see a good amount of street duty while still being competitive in nationals. Prepared classes usually have compromises. SP, you can still use one car, though after that, I would think it requires a trailer.

RX7MAVEN

I purchased my first new car in 1956. It had duel exhausts. I thought it was the cat's meow. I am running Borla dual exhaust on my 7. Duals are still the cat's meow.
Duels used to suggest performance.
Cat's meow??? Most of you are too young to understand..

NZConvertible

Jeez I wish people would stop parroting this nonsense... You can get exactly the same performance from a properly sized dual-muffler system.

If you keep telling yourself that, maybe it'll become the truth... 30lb off a 2650lb car is not huge. It's very small. Even smaller when the weight reduction is more like 20lb and your car probably weighs more than 2650lb. Any improvement in performance will be equally small.

Of course you did. Any free-flowing exhaust will be an improvement over stock. That's got nothing to do with changing from dual to single, it's because the pipework is bigger and the muffler(s) are less restrictive.

Basic rules of physics say that a dual system will be quieter than a single system for the same performance. IMO sticking a performance-killing butt plug in your exhaust is the ultimate in poor engineering.

You mean power when you decide you want it, stop the car and get out, remove a piping hot butt plug covered in soot with your bare hands, get back in and drive off. Real handy...

Roen

iTrader: (2)

Hey......I didn't want to say it. =P

Valkyrie

1. If you take care of the ounces the pounds will take care of themselves. Every bit counts.

And in terms of weight reduction, 30 pounds for a single part is a very big number (there are few things that can easily lose this much weight besides the driver and the hood, at least not without spending a fortune...).

2. They make silencers that are exhaust pressure-activated, and perform almost the same as no silencer, as well as silencers that are remote controlled butterfly valves.

3. How is a single system with the same equivalent amount of exhaust restrictions going to be any louder? I imagine the noise will be more concentrated since it's coming out of one hole instead of two (but you don't measure noise at the tailpipe, you measure it at a distance from the car), and it might be marginally louder overall (due to acoustics and whatnot), but I doubt it would be a really noticeable difference.

OTOH, my dual system is exactly where I like to draw the line between quiet and too loud for the street... you can here it coming from a block away, but it's not going to wake any babies unless you do something really obnoxious... and it doesn't leaf you half deafened for at least a few hours of highway driving. lol...

niburu

iTrader: (1)

I have 90 GTU with a single 2.5" catback exitting from the driverside.
The original oem Y-pipe rusted off the cat.
I went to the local muffler shop for a cheap temporary fix, 2 years later it's still holding up fine.
The car runs noticeably better and haven't gotten any negative comments about the look (no one really even notices exhausts quite frankly unless they're loud or shiney).
It's plenty quiet, certainly quieter than the 91 FC I just bought with gutted cats.

dial8

iTrader: (4)

Uh, I run without silencers all the time. I like dual more than single, but I've only foun one full titanium dual exhaust and it was $1900.+shipping. So I know the 3lbs. I save at the track by switching to single REALLY isn't helping me, but I like teh bug-eyed stares I get tell people that

TehMonkay

iTrader: (-1)

Why don't you all quit arguing and just pick what you think looks better. And for those of you who have a big enough turbo to need anything bigger than anything that is bolt on, you can ask your exhaust shop what they reccomend, or your tuner, or engine builder.

Sound good?

stylEmon

iTrader: (2)

NZConvertible is trying to be a freaking communist here. Someone notes their experience and opinion and he keeps saying "YOUR WRONG, LISTEN TO ME"

So you have experience in " a properly sized dual-muffler system" as you've said 500 times... good for you. For those of us who dont have thousands of dollars to throw away experienting with exhaust systems, we'll take our single and try to make it quiet.

what is the difference in your typical dual vs. my typical single? ONE FREAKIN MUFFLER! It's my opinion that the extra muffler isnt worth the money or sound. It's also my opinion and experience that the single aviods any potential flow issues.

In my hood, my 7 is quiter than ANY non-stock dual. So I've obviously done something right...

On behalf everyone that isn't a exhaust engineer, get off it.

RX7MAVEN, your typical sports car has always been a V8 right? On the 7, exhaust exits on only one side so there is no real need for a 'Y'. I think dual looks better most of the time, and does tend to make people think performance. I dig the sleeper look, so that's why I dont bring attention to my exhaust. To each their own brother. Please explain the cats meow...?

Mechanic

i got single, very loud, oh well what u expect for 100 dollars for a jic.

still insearch for the sdj header, banzai! is it comming along yet?? -=(...

will need to do a borla xr1 presilencer, rb presilencer does close to dick about silencing.

Black91n/a

If you want no cutout, then AWR makes a stock bumper copy with no cutous, just make your own on whatever side your exhaust is, then it'll "look right" and maybe that'll get some of the people off your back. If you're willing to put up with the possibility of more noise in exchange for the reduced weight then great, go single, if sound and symmetry is more important to you than weight then go double.

Just do whatever you want and be happy.

Nihilanthic

Why is this even a ******* debate.

Seriously.

If you don't pair the pipes coming out of the exhaust ports you miss out on maximizing your scavenging and thus power production.

Would you put duals on a I4?

FWIW I don't see any car that benefits from 'duals' except possibly a cross plane v8 and even then a Y-pipe at the right spacing would work fine and save on weight!