RotaryMan88

Just curious, I know mazdaspeed7 does. Is anybody else using a dual header...straight pipe setup? I'm thinking about going w/ the MAZDATRIX setup unless any of you can convince me otherwise or know of a cheaper way to get as much power. Thanks...

adeckbar

i did the dual exhaust set up on my 86 it worked great was a little loud but helped out in the torque department big time i would recomend it to anyone i even had my 6 ports open all the time and it had a lot more pull on the bottom end

Dak

I think someday I may get the RB road race header and build my own system using my current mufflers.maybe use a couple of dynomax race mufflers as pre-mufflers to keep noise down,but then I have one RB pre-silencer already so I would just have to get one more and I think I could build my own system that would be almost the same as Mazdatrix's.Just get the local exhaust shop to weld it up for me.RB sells all the flanges I would need on their web site.

rx7style

iTrader: (1)

Me. Dual RB race header, straight 2.5" pipe to Brullen mufflers. Aaaah, the sweet sound of the rotary.

Eshaft

iTrader: (2)

Anyone ever see or do a true dual exaust like the mazdatrix one except with dual high flow cats so it's a little bit more quiet, and more legal than streight pipeing it. ???? Been stoped one too many times...

Scott 89t2

you don't want a true dual. most power from a 13b is dual header to dual pipes collected at the back into one muffler. there is an exact distance back from the engine where you want to collect it but I forget. about a foot infront of the muffer is where.

150" rings a bell but I can't remember if that was from engine or header flange back. I think it was 130" for 12a.

stinkfist

12.5 ft? Plus another foot BEFORE the muffler?!?!thats about 186" of exhaust. And your car is 168.9" long . that will look funny.
Just messin with ya.

Mike

mazdaspeed7

True dual gives more peak power than collected, but it also moves the powerband up higher in the rpm range.

RXTASY1

I don't understand the term "Dual" on a rotary?
I guess I'm from the old V8 school where the pipes come out of each side of the engine. Some end up in the same place (single exhaust) and others stay seperated to the end of the exhaust (dual exhaust).
On a rotary, you have to seperate the exhaust ports and keep them that way. Most headers go in to one pipe and then seperate. What's the purpose?
Of course I am used to the turbo where you just install a downpipe. The bigger the downpipe, the better. Single exhausts flow better on our cars. period. I have an Apex GT. It's the most awesome exhaust I have ever seen!
Let the flaming begin!

Scott 89t2

a true dual exhaust on a rotary means you have 2 pipes from the engine to the back. a rotary has 2 exhaust ports. so you run one pipe from each to the back. they don't come together. same as harleys and v-twin bikes.

zoom_zoom

im thinking about getting the mazdatrix dual exhaust system but with the exchange rate its gonna cost me like $ 2200.

RX7nCRX

My exhaust has been producing amazing results.. and its pretty simple.

Felix Wankel

Right idea, just wrong measurments. The exhaust on my 12A car is dual all the way to the rear axle, where it collects into the muffler.

rx7style

iTrader: (1)

How does the pipe not converge on a v-twin? My Suzuki SV650S only has one muffler so....

sickboy

pretty much every V-Twin bike on the market, excluding gimp lil 650cc entry level twins, uses a true dual exhaust setup

Felix Wankel

Yeah look at the TL1000R (what I'm trying to buy)....Big fatty dual high mount cans

RXTASY1

All the headers I have seen including Racing Beat, converge in to one pipe.
That is not a true dual exhaust.

SureShot

Cheap, but good... I bought the header kit from Mazdatrix and had a local shop assemble the kit & weld up a full dual. When you stand behind the car at idle, the stereo effect is unique to a true dual. I still need better mufflers to lower the tone. The power is noticably better, especially on-ramps 40-70 MPH in 2nd gear.

Felix Wankel

Racing beat has 2 different style headers, and Mazdatrix's design is dual too.

RXTASY1

Hum??? Is this what you are thinking of?


http://www.mazdatrix.com/e-gray.htm

RXTASY1

OK!!!! I see now!
I saw the Racing Beat "Road Racing" header.
It definately seperates!
Learn something new every day!
I wouldn't use one that goes in to one single pipe.

Supermac

I called mazdatrix the other day and talked to the dude. He said he had the Dual system on his car for a few years and loved it. It is a true dual, seperated all the way back. The mufflers are HKS, and they give a deep low tone.

He said they are backordered on the mufflers, HKS hasnt shipped any lately. He also said the system is $1399, that's a bit much for me

Felix Wankel

Yup. Here is the Mazdatrix exhaust.



And for all you guys that say its a 28% increase...How do you know the car they dyno'd didn't have clogged cats or something? They never gave a hp number, just a % increase.

Going by that theory, I could take 2 of my plug wires off, dyno at about 50 hp, put some new Magnacores on, get back to about 110 (12A car), and say my new plug wires gave me 60 hp.

Don't believe everything you read.

kliftin

ok, so can anywone put duals on thier car and give dyno proof to thier results. I think we would all apreciate it. I have the duall rb but cant find a muffler shop that will weld pipes on it. They quoted me 150 for streight pipes all the way back from headers, the heads cost 180 all together with shipping and flanges. so for 330 you can have dualls. I think its the best thing to do for the money. but can anyone telll me what mufflers will quiet it down. billit , magnaflow. I have a long billit muff on my current single streaight pipe and the sucker purs like a kitten. with two on a dual it shouldnt be that loud right. Like unberible or anything.

kliftin

oh, as for 28 perc. That equals 40 hp on my 89. Because if mine is 120 at the weels then 120x.28 =over 30 , consider 25 perc loss at weels thats around 40 at flyweel. who knows. I would tecknically be at 195-200 at the flyweel. mabey mixed with an intake. sounds right. what does mazdaspeed7 have to say.