I have a rb header to straight pipe to stock replacement muffler and its to loud and way to raspy. I would like there to be no noise at all w/out sacarficing performance but i know that is prob not realistic. So what if any is your recomendation. Please dont just say RB. Realy looking for some thing quiet like i said silent would be nice.
Thanks in advance Peter A. Trapino

 

What did you expect with that header and a straight pipe? A quiet rotary doesn't exist, or one that I've ever known of.

 

go buy a rx8 or put a HIGHLY restrictive cat on there

 

With a header and straight pipe it doesn’t matter what muffler you use it’ll never be quiet. Your going to have to lose the straight pipe and go with presilencers or cats.

 

yeah once you ditch the stock manifold for a header ts all over, i even had a header piped to a small oval style muffler then to the stock muffler and it was loud as hell

 

I've got a single outlet RB header into a RB mini presilencer and another bottle style straight through silencer, which then goes into a single in/dual out Magnaflow. That makes the car quiet enough to pass inspection. Measured 12 feet from the car, it's 85dB @ 3000 RPM.

That's probably as quiet as you're going to get without getting a baffled silencer/muffler.

 

what would i gain w/ a magnaflow bullet style muffler right after the header and how do the rb presilencers work?

also eriks85rx7 go f-yourself!!!!

 

just sayin what do you expect with a straight pipe, on serious note tho try out Rb pre silencer and a racing beat muffler, kinda expensive but it should quiet down your car some, or atleast make it sound better.

My car has a custom exhaust set up on it from a local shop. I do not know what brand of muffler it is.. I looked all over it and all it said was made in USA so im clueless, it made my car have a deeper tone and gave a lil bit more hp.

 

would it be stupid to throw a magnaflow in there or should i do a rb pre-silencer? Also what is the diff in rb pre-silencer's?

 

Nah, RB Header, strait pipe and RB Muffler= Sweet souding rotary! Not loud....just right!

 

RB systems are almost as quiet as a NEW STOCK system.

As I like to say: Quiet, Cheap, Free flowing, Durable. Pick three.

(excepting Quiet/Cheap/Durable, which simply does not exist for certain values of "cheap"... cheap durable systems are usually quite loud, and not always free flowing)

 

I have a straight pipe back to a magnaflow. It is a truck style round muffler #12640 (6" diameter, 2.5" in/out 27" long muffler body, 31" overall length). I personally think it sounds great, and other rotary owners have also told me that. It is not to loud and not to quiet and since it is straight through I am not sacrificing performance for sound quality. You could probably go with a shorter muffler than I did and you can use an oval style also (they are easier to fit in than my round muffler).

 

Best I have found is the RB muffer, second best is a good stock muffler.


I have no other options to offer you, Because these are the only two that have worked for me. Everything else I have tried has been loud or died in two weeks.

 

Try a Dynomax Super turbo muffler. They are pretty quiet and are totally fine to use on a stock or street port engine. They are also fairly cheap.

 

Super Turbo... more details? There are about a half dozen variations.

I picked up a 2 1/2" Ultraflo SS for $40. Plan on trying it on the P-port. Anything should be quieter than the ventilated Pacesetter on the car now.

 

i have the complete rb streetport system which consists of uncollected header, dual presilencers(one on each pipe), and primaflow muffler, and i'd bet it's quieter than that.

 

You don't want a super turbo on a peripheral port. Those engines are much more sensitve to backpressure than stock or streetported engines. The Dynomax super turbo that I use for my 1st gen is part number 17733. It is about $48 depending on where you get it. Summit Racing has a $25 rebate on all Super Turbo mufflers right now. It is a 2.5" offset inlet, 2.5" center outlet. They work great and muffle quite well. Don't let the fact that they aren't straight through discourage anyone from using them. For a stock or streetported engine you will never notice a difference in power between these and a straight through design. For a bridge or peripheral port you most certainly will though. Definitely keep that Ultra flow for that. It will be loud though!

 

Could be, but isn't the RB muffler offset? There's a thread floating around that shows the innards, and it isn't a straight through design at all.

 

you will not gain the most power from the rb complete systems... but they are so very nice sounding and quiet. they are a great exhaust, don't get me wrong... but they compromise power for tone and silence. so it depends on what you want. if you are really looking for the most ponies... it's not gonna sound stock.. if you can accept a little loss... run the primaflow muffler from RB. it's worth it.

 

that's what makes a quiet muffler. u can't expect a muffler that u can hold up and look in one end and see out the other. sound just goes straight thru it. a good muffler that reduces sound alows the sound to enter, bounce back on itself, then exit, thus reducing the amount of sound coming out. those straight thru mufflers don't make it quieter, they just change how it sounds.

 

Hi I have an 85 12 with a rb road race header. I used to have the rb setup thats on rxtasy's car. When I got my new rx7 I wanted a new exhaust but was broke. I have tried every combination known over the past 25 years and nothing is as quiet as the rb setup yet makes the most horsepower. Until what I stumbled across recently. Years ago I used 2" tubing and ran true duals with an equalizer pipe. This back then was extremely loud but back then I didn't care. What i did on my new rx7 was the same principle except I'm using a pair of stock cbr900 mufflers. This sounds very quiet like the rb setup and make almost as much horsepower. This setup is so quiet that you can actually bore some small holes in the end and adjust the sound and back pressure to your own liking. And usually you can stop by your nearest motorcycle shop and pick up these stock pipes for free since everyone is upgrading to performance stuff. I have a total of $150.00 in mine.

 

Tell me more rgood2b. Pics would be dope.

 

these things look really good and tuck up real nice under the rear. i was extremely surprised how quiet they were on the stock port engine. i'm curious how they'd sound with the sp. i'd like to get up some sound files of different setups and post them.

 

The best thing about the Racing Bleat presilencers is the TONE they impart to the exhaust.

Not just quieter, but actually less tinny and more throaty in character.

(I'm talking about the full-length units, not the "mini power-pulse presilencer" which is a raspy little devil.)

 

Hold the phone. I kinda glossed over this the first time, but went back to check today since we now carry Magnaflow mufflers.

The crux of my post:

Where the hell do you have a nearly three foot long muffler?

I don't see where there is room for a 2 1/2 foot long, 6 inch diameter muffler, unless you do it Andrew Havas style and put it sideways under/behind the rear bumper. There's only 20 or so inches of length available next to the gas tank. My car isn't hurting for ground clearance (understatement of the year ) yet I frequently grind my (mid mounted) 4" diameter glasspack on sloping driveways and curbs and stuff, and it is as high as posisble before actually rubbing the floor.

So, I wanna know where you put the thing!

I can get one "fairly" cheap. After I re-pack my glasspack with steel wool, I'll run that into my Ultraflo. If that's too loud (can't be much louder than my Pacesetter, which has a golfball sized hole blown out of the front face, but it's still semi obnoxious) then I can throw the Magnaflow under the bumper.

Quiet is very important to me. I have sensitive ears (eyes too, hence the shades even indoors sometimes) and listening to three hours of 4500rpm WAAAAAAAAAAAAA then racing then listening to four hours of 3500rpm WAAAAAAAAA gives me a week long headache.

FWIW - the mufflers Summit has on sale this month (Summit brand, fully welded, only $25 a pop) are semi-straight-through. You can see light from one end to the other, but they are built like Pacesetters. There's a perforated inlet pipe, which goes to an open chamber which has a plate with three or four 1-1.5" diameter holes in it blocking the path, then a perforated outlet pipe. They work, sorta.