RX-73sprbeetle

i have a 84 and i was wondering. WHY IS HTERE ONLY ONE KIND OF EXAUST FOR IT!!!!! i cant find any dual or just hks style. please help me.

--craig

roarinrotaryrx7

iTrader: (8)

Dual setup isn't possible on an FB. The gas tank is in the way. Single is more than adequate anyways. Even on FC's it's a single till the rear axle then it spilts. Go with full Racing Beat exhaust system. www.racingbeat.com

trochoid

iTrader: (6)

RB has a dual setup, but it collects before the axle. HKS ignores the 1st gens.

fcdrifter13

I had a daul set up I made custom. Cost me around 200$. But If I were to do it again I would do it differently.

OLD
Racing Beat header
2 1/4 piping
Y pipe into Borla XR-1
Back to dual over axle
2 Ebay knock off N1 cans


NEW
SDJ header
2 1/8 piping mandrel bent
Y pipe into Borla XR-1
Back to dual under axle
Accual N1 cans

steve84GS TII

Because 1984 was over 20 years ago.The auto aftermarket isnt going to invest a lot of money making parts for a car that was built before many of their employees were born.Let alone one that isnt a collectors or classic.
That isnt to say our cars are worthless,but there WAY more kids driving Hondas,Toyotas and what not.Thats where the money is.There are enough 1st gens out there that they are considered common,but they are not prolific enough that a company would make money selling NEW parts for them,especially when Racing Beat,Mazdatrix,Rotary Performance,Mariah Motorsports and others have been selling their 1st gen parts for years and years.

RX-73sprbeetle

all i can find is a single muffler with one or two tips. in my opinion thats just ugly any sites or anyone want to sell a costom exaust?

steve84GS TII

Youll never get more than 1 muffler on a 1st gen,theres no room.Unless you put them inline or you turned two mufflers on their side and placed them side by side.....which doesnt make much sense.

There is enough room in back for just about any universal muffler you can imagine.However,there are very few mufflers out there that are compatible with a rotary engine.Sure,anything can be bolted or welded up,but VERY few mufflers are going to be quiet enough to be legal or will be able to hold up to the extreme heat a rotary produces.Even less will be able to do both.
The RB muffler is just about the only thing out there that can last 5+ years behind a rotary and be quiet at the same time.They make a slightly louder version called the streetport if you want some sound,but even that one is MUCH quieter than any Magnaflow,Flowmaster or other melonshooter muffler you might install.None of which will last long or not make your ears bleed.
If you dont like the RB's look,you can whack the tips off and weld on some new ones.Thats what I did....



The RB muffler is so well respected that almost all major rotary companies sell them,wheather by name or rebadged.They are made in Italy and are VERY,VERY tough.
http://www.mazdatrix.com/e79-85.htm
http://www.racingbeat.com/FRmazda1.htm
http://www.rx7.com/store/rx7/saexhaust.html

rotary_sex

yes they are tough, but very restrictive.... why do you think they are so quiet

rotary_sex

a far as you go, this aint no honda, better get used to it

rOtAryIsbEttEr

black dragon offers a monza exuase, but i dont think it is quite as popular as the RB system

autocrash

...sell your car (to someone who will respect it) and buy a honda...

aussiesmg

iTrader: (1)

It has been proven that at a certain length the headers are joined to one pipe as this creates more power, two pipes all the way back have poor results on the dyno.

RB have been doing this for many years and do a good job.

SDJ is the best header bar none.

RX-73sprbeetle

autocrash, first of all i didnt ask this question to get critisized and second who the **** are you to judge me? ill do what ever the hell i want to my fb

to each his own

*RX007*

iTrader: (4)

i think what he means is that there is only one type of exaust made for the fd and that is the rb style. the best thing for u to do is have a custom exaust made for you with the mufler setup u want...

ChasRX

Economies of scale; limited market with no real return on investment if someone were to mass produce a dual-exhaust design. Steve84GS and RX007 is correct. Just do a one-off custom for yours and show it off! I don't think I've ever seen a dual exhaust system mounted on an SA/FB.

trochoid

iTrader: (6)

This is the point everyone has missed, including myself.

From a performance stand point, collecting the exhaust at 12, 24, 96, or 108", provides the optimum performance, depending on whether one wants low end torque or high end hp.

Research, testing, dyno and track time have proven this, thus, no one makes or markets a true dual.

To the original poster, you asked a question, you got answers, some were not what you wanted, but you got them. Deal with it and don't be so sensitive. Attitudes get few useful responses.

steve84GS TII

They are quiet because they have no baffles to rattle,are made with very thick wall steel,and they have TONS of packing material.This makes them heavy,but it also completely eliminates any secondary noise from the muffler.Any other muffler looks/feels like a tuna can by comparison.
The RB muffler is straight thru,its no more restrictive than any other straight thru type "glass pack" muffler of the same internal diameter.

Yes,the standard RB muffler is about 2.25" internal diameter,it might be a little more restrictive than some,but its far from a bottle neck for an N/A engine with less than say,a bridgeport.
The SP version is a little over 2.5" at the inlet.For the last 5 years,Ive run a streetported,TO4B boosted, 13BT with 14psi through my SP muffler.......tell me they are restrictive!!!I pass CA noise emissions testing and pump out 300 daily driven HP, with no ear bleeding,no buzz and no blowouts.

fcdrifter13

Like I said I had 2 N1 style cans on the same side. It was an extremely tight fit. But dont do it just to have it. That setup was a headache, and I am pretty sure that it was way to close to the fuel tank the way I had it setup(over axle). A good single is nice but I always like duals and thats why I did it.

A SDJ header into a xr-1 as a presilencer, into w/e style of muffler you want to use in the rear. Magnaflows sound good out back, just for reference.

*RX007*

iTrader: (4)

when he said dual he meant dual tip like the oem exaust. but i completly agree w/ u guys and like we said u should make or have some one make u a custom setup that ud like.

Rotor13B

If that's what he meant, Then that's what he should've said cuz we're not all mind readers here.

*RX007*

iTrader: (4)

ya i know but hes a newb? i know him personaly and thats what he meant. lol

trochoid

iTrader: (6)

Funny, both the stock and RB mufflers come with dual tips. Many of the after market ones have a choice of tips also.

rxtory

there is a guy with a FB that managed to make a custom exhaust to work around the gas tank for the dual look, if it was safe or anything i dont know. I might have a picture on here some where

TAS

if you are going to take the plunge into a true dual setup, I would look into a x pipe. This will help the exhaust pulses merge behind the negative pulse wave and increase the exhaust scavenging effect. I personally wouldn't go larger than 1 7/8's for a street stock port 12a.

I don't have access to a dyno anymore seeing as it burned up in the fire but I was going to test a few theories that my buddy and I though of for a good dual setup to tune for specfic RPMS.

trochoid

iTrader: (6)

There has been some testing on H and X pipe crossover links. They didn't find any useful gains.