1)What Should i get..RB true duals?

2) Use 2 to 1 header with custom 2.25' straight piping into a single apexi n1 muffler?

Which will make more power? What is the disatvantages and advantages of both of these exhaust set-up's?

 

11 views and 0 replies...bump!

 

I curently have truedual system on my S5 rx-7.. Sounds nice and quiet, and pulls like a bat out of hell.. I don't have any expereince with a Single apexi exhaust though.


My system consists of road race headers, two maganaflow 22" presilncer, rb rear mufflers.

 

I think that's because it doesn't really matter which you choose.

If this is for a street car, I suggest that you select a kit that is already proven to work. Too many people try to get slick or go cheap with a custom exhaust that doesn't work correctly because of poor design. For example, pre-silencers are ignored, turbo mufflers are used instead of the proper NA mufflers, header lengths are not correct, pipes are too large, etc. While a kit may cost a bit more initially, it is less expensive than screwing up a custom design several times until it finally works.

 

#2 will make your eardrums bleed, and I don't see it making any more power than the RB exhaust (may even make less)

 

I put together a long collected 2" into a 3" and then the Apexi N1 Muffler... Yes the LARGER one.. mediocre to decently ported 88 6-port.

It is the LOUDEST thing I have ever heard. It is actually louder than it was with the header alone.

COuple factors... it is long collected.. and hence tuned because I made sure the length was correct.. not just "hmm that looks like a good spot so I can go around the axles..." Nope.. It is two pipes under the rear subframe etc.. mandrel plumbing etc etc. Into a 3" collector. THen into the N1.

There is a guy that is from canada with a 12A bridge ported formula car that has a full body... I think it is a DSR car. It is TERRIBLY Fast... Mucha? mor Mouchha? SOmething like that.. Anyhow.. everyone comments on how loud this thnig is. The N1 on my 91 is MUCH louder.
My kids LOVE IT... I dont like it so much. I CANT drive it after the sun goes down for fear my neighbors will burn down my garage. My wife hears me over a mile away when I am coming home, or leaving.

Evilaviator laughed at me when I bought the muffler... but I put it together for the EP car to test its efficiency.. and its tune.. And YEP.. it is VERY well tuned. The N1 is a megaphone inside.. from 3" to 5".. Yep it pulls like a freight train. Yep it appears at this point to be much more efficient at scavenging than many other designs I have seen or used.. (Mufflers, and collection point mostly)
HOWEVER..... Not soo much for the street.

IF... IF I was going to do a street version... And tuned.. with performance was the point.. I would go long collected... ~112" with a muffler like a Ultra Flow.. or any other ceramic packed flow through muffler in 3" And a 3" down Spout on it.
The the kicker to keep it quiet enough? Do like RB does.. but two SS packed mufflers that are 2" in/out bullet style/cherry bomb style and put them int he runners that are going back from the uncollected header.
You can run it at 118" with the two cherry bombs and a street tuned motor because the pre-silencers will effectively increase your pipe lengths because of the dampened area in the mufflers. So the pulses/engine will "see" longer runners than are there.

 

That's because you put the turbo N1 muffler on your NA, lol.

Also, I think you may have been trying to beat out Capn' Wankel for the title of the loudest RX-7 in Florida.

 

HA HA HA HA

Maybe we should have a DB contest... Like they do for stereos.. LOL

NOT

 

my friend pat has a TII with 3" piping to a Apex'i N! muffler.

sounds mean, but is kinda loud...i dont mind it.

he dosent have cats also...and shoots flames like its his job

 

yea i want the n1 mufflers that come on the apex duals for the fc n/a...there big!

 

N1's suck ***** if you have any self respect for you and your street car. If you have a race car...great grab a 4" muffler and go make your tuned single.

Otherwise put the cash down for a true dual setup. Mine are closing up on 50k miles and still sound good(with the exception of a small exhaustleak due to a bad gasket) Large mufflers make you look like any ricebox/shitbox driving kid. The RB mufflers are atleast dignified looking and sound awesome.

 

... man, this gives me all sorts of bad ideas that would **** off the neighbors (even more than the race car already does!)

 

well i wanted 2 know the advantages and disavantages of both set-ups like power wise and stuff..not peoples opinions about how n1's suck or rb sucks...

 

his N1 is a single...not a duel. and if fits perfectly with the car....

if i get his permission ill post a pic of it shooting flames so you can see it..that is if you guys want me to though

 

YEA! i wanna see.but im starting to lean towards the duals now and i was wondering if any1 has that sound clip of the rb duals...i heard it before but cant seem to find it..

 

http://www.mazdatrix.com/pictures/racing/exhaustrb.mpg

 

I build a true dual system for my old FC, sounded great and still it was quiet due to the stock mufflers. I have driven a collected 2½" freeflow system. Highway cruising required earplugs

http://www.wankelkim.net/rx7/dyno%20(2).AVI

 

sounds pretty nice while driving...but the video i was actually looking for some1 2 post was a sound clip of the duals at idle then revvin it...

 

sorry its so dark, but maybe you can make it out...its the only one i had.

nice flamage

 

SWEET! i wonder if that hatch got scared

 

I'll post a sound clip of my car and its TD's

 

www.aztechrotary.com/tduals.wmv

right click/save as.

 

I've got n1 duals on my TII. They look and sound awesome. Chris at Rotary Performance and I were talking and he even said that he thought the were the best exhaust made for the FC. 1987Rx7guy if you think they don't look good you are gay.

 

i like my apexi n1 duals on my NA... i dont even think there loud

 

OMG i want the rb duals now...