LookThatsMe

if you dont want it to sound like rice then why did you buy a jap car? or anything thats 4 cylinder or under... and people dont say that a supra sounds ricey cuz its sounds beatiful...

gxlspeeder

rotarygod

iTrader: (1)

I think the bumblebee sound he was referring to is that annoying raspy buzzing sound that some exhaust systems give. Not all of them have this. It's all in the muffler design.

ra ra rotory

A resinator also helps..

gingenhagen

Those ramps are so great. Makes any work under the engine a piece of cake. And if I want to work from the top, just back it out, move the ramps apart, and drive it back in. My only complaint is I can't fit the minivan or SUV in...but then again, SUV has plenty of room underneath to being with.

GTUser

Pictures are worth a bunch of words, here is the best reason for duals, the car is designed for duals, it runs better with 'em and they provide the artistic symmetry that the designers intended. God designed you with two arms, two legs, two eyes, etc. Would you look better with one arm? Would you run better with one leg? Could you see better with one eye?

Madrx7racer

N1s.......

SureShot

Loose the iron box collector and go for a dual header, then go dual all the way back. With 2" pipes & cats you gain some noticeable high end power without loosing low end torque. You will want pre-silencers (or cats) in the middle. Without the silencers, the sharp pops of the peripheral exhaust ports sounds like an airplane propeller at takeoff, and they will blow out the mufflers..

My previous ’91 NA duals w/header setup was on almost 2 years when I sold the car. I was on a tight budget, so I got the Mazdatrix header kit & had a local shop weld it up. They used two "turbo-pac" presilencers and two bomb mufflers at the end. We reused the original muffler’s connecting flanges and the stock tips. The whole deal was $300. As for loud – Yea if you open it up, but after a year it’s still fairly quiet below 3k and at light throttle.



Click here for MP3 stereo sound file to hear idle tone with a throttle blip.

mazdadude

iTrader: (2)

mine, otto racing universal 20 inch mufflers, 6 inch wide body, and 4 inch tip. 35 bucks each from procarparts.com

Tofuball

Dual Exhausts will almost always be quieter, as they will usually have twice as much muffler.
:True Duals: is what I might be going in the future once the systems get a bit older and I can pick one up used

I've never liked the single systems, too loud for my tastes and too ugly. If you do decide to go single, please fill the hole left in the other side of the rear bumper

Ice_Wolf

Technically, the only way to get a true dual exhaust, would be to run to seperate pipes off the headers, in which case an RX7 does not have. You could somehow rig it up to have one pipe connected to half the ports on the exhaust manifold, and have another pipe connected to the rest for a dual exhaust, but that would be hard and look cheasy. The only way to get true duals would be to have a V6, where you have two seperate exhaust manifolds and can hook two individual pipes up. If I was picking, I'd definitely go with dual mufflers. They look much better because the bumper has cutouts for dual mufflers.

SureShot

Single turbo's have one exhaust outlet, but with NA's a header is one of the best value performance mods.
The header can be collected or dual.
RB has some really nice ones.
This is a picture of my cheap home made header.


On my prevoius post there is a link to a stereo sound file.

Ice_Wolf

One exhaust outlet? That means that you couldn't have true dual exhaust unless you custom made a exhaust manifold. The most you could do is Y-pipe off the one outlet and rig up a dual exhaut from that. But, that would be a waste of money. I know FC's love to breathe, but dual exhaust isn't worth the money. At most, I'd split the exhaust after the axle and have dual mufflers. I'm guessing if you did that, you'd wanna go with a 3" exhaust before the split and 2.5 after. I'm only saying 3" because of the turbo. I know on a 4 cylinder car, you don't wanna go more than 2.25" with N/A and 3" with a turbo. I'm guessing maybe an FC is about the same?

Tofuball

Racing beat sells a true dual system.

Each rotor has its own exhaust the whole way back.

Check it out sometime.

NorCal90

True duals, just for Ice_Wolf : http://www.mazdatrix.com/r-ex86nt.htm

NZConvertible

Bingo! You've finally figured out what everyone's been talking about. Two rotors, one pipe from each rotor, no stock manifold.

d0 Luck

here ya go

RB header to 2.5" truck size glasspack to 2.25" y pipe to dual n1's






not that loud since the motor still has the stock exhaust diffusers.

car is for sale btw. preferably local

Ice_Wolf

Thanks for clearing that up guys, remember I'm still a piston type of guy, so I don't really know how the rotaries have their exhaust set-up. In the cause of one outlet for each rotor, you could do a true dual exhaust. Thanks for leading me in the right direction guys. So if you were doing a truel dual exhaust, you'd prolly wanna do something like 2.5" piping? Anything smaller would be too restricting, and prolly anything much bigger might show a loss of backpressure and torque.

mali_FC

Drag'nGT

Anyone have a nice rear valance with the dual exausts?

mali_FC

sorry the picture in my earlier post reply was too dark..heheh

NorCal90

I don't think you need pipes bigger than 2.5" for each rotor Ice_Wolf. The RB Road Race exhaust system uses 2" piping the whole way back and I hear that works wonderfully. Someone correct me if I'm wrong please.

owen is fat

go with some duals!
rusty.
crusty.
not shiny.
understated.
humble... but with lots of rumble!

marlaman

You might be right.
The Mazdatrix True Dual exhaust has 2.5 all the way back and it's heavy as hell.
But sounds tight and will outlast my car probably :-)
Matt

1987RX7guy

iTrader: (3)

You're right on that one. Instead of replacing my exhaust on my 87 I had to replace the 87 with an 89. The car didn't make it through the crash but the exhaust sure did.