I've been looking/searching around quite a bit, and the only full exhaust system that I can find is at racing beat. I plan on streetporting my engine after it's rebuilt, so I would like to get as much power out of it as possible by opening up the exhaust flow.

What I need to know is this: Why does the racingbeat.com streetport exhaust system cost $800? Is there any specific reason, besides the fact that it's a brand name? I couldn't find anywhere that said that it was stainless steel, and it definitely doesn't look to be stainless steel.

Or could it just be that the RX-7 exhaust is a little difficult to piece together? I would assume it would be pretty much the same as a piston engine.

Are there any other places I could find a full exhaust system that would give me the flow I would need to get the most out of a streetported 12A, non-turbo?

P.S. I do realize that the Racing Beat exhaust system comes with pretty much the whole exhaust, i.e. the headers, cats, mufflers, etc.

 

Just go to any muffler shop and have them install a dual 2.25 exhaust to 1 magnaflow 2.25 muffler. If you have the headers, the above should not cost you more than $200 (about $150 here in LA). If its too loud for ya, then use glasspacks til you can afford to buy a racing beat FC/TII presilencers. I said, FC presilencers as the FB presilencer is too small (and the rb muffler is restricted as well) from my experience.

 

The biggest difference between a piston exhaust and a rotary exhaust is the heat that it needs to deal with.

A cat made for a piston engine will be destroyed in short order when put on a rotary. The muffler will also have issues if not rotary specific.

Stick with racing beat or another rotary specific system.

 

My pacesetter setup from Victoria British is working well for me. I believe $100 for headers, $100-$150 for muffler. $40 for a pipe welded between headers and muffler at the muffler shop. Should be $300 tops for all.

I'm sure the RB setup is well worth the extra dough though. I just didn't have that much to spend on exhaust, personally.

 

Will a magnaflow muffler withstand the heat produced by the engine in an RX-7?

 

let me say it this way. The RB stuff will outlast every available stuff out there. For stock or mildly ported, its ok. But too restrictive for a big streetport. So the choice is yours and you cant have both: Its either loud = faster OR quiet = restrictive.

Dont think im just bad mouthing RB. Just like anyone else, I was into the RB hype many years ago but when I began unbolting RB parts, I noticed a big improvement. Recently, in my bros RX-2 with FD bridgeported motor/51 IDA, we switched the muffler from HKS to primaflow. It made it very quiet and now the car is not as fast as it was before. So after SS7, primaflow will go in the storage for future event.

 

I have a Magnaflow S/S with duel outlets. Polished, looks good, but you will need a presilencer, unless you don't want to listen to your tunes.
TCS

 

The RB exhaust is made really well. It fits perfect, the walls are a little thicker that the average piping. It is a little restrictive but it quiets it down quite a bit. When I put my Primaflow on I lost a lot of top end but at least I can drive around town and not be hassled with by cops.

 

 

So if I went with getting an exhaust made by a muffler shop or something of the sort, I suppose I could put a pre-silencer on it to make it a bit quieter? I'm not worried if it's very loud, that can always be fixed. Besides, I'm used to riding around in my brother's 85 Scottsdale with dual exhaust and flowmaster mufflers. He even took the cats off and drove around for a while. This is also with a 350, not a 305 or some dinky engine.

Or am I underestimating the noise of a rotary?

[EDIT] I just realized that I made 2 posts on accident. Board was lagging a bit, so I'll delete the other thread.

[another edit] OK, maybe I won't, since I don't have the option to >.<

 

You are underestimating how loud a rotary is. A 350 with a Flowmaster is like a rotary with a presilencer and Magnaflow.

 

Without a pre-silencer I can guarentee it will be louder than anything you have yet experienced. In addition to great heat and flow, rotary exhaust is stupidly loud. Like so loud that if I were to run my car with just the header you would not be able to record the sound with a regular microphone because it will be overpowered with sound. So loud that when you plug your ears you can acutally FEEL the sound. That all said, I love my custom system.
Grant

 

A rotary with a straight pipe to a magnaflow muffler will sound as loud as a large V8 without exhaust. Hopefully that gives you a good idea of how it sounds. I don't personally like racing beat. IMO, their exhaust only allows about half the potential of what a wide open exhaust would. Their primaflow muffler is just as restrictive as the stocker. But most of the gain is with the elimination of the cats. If you don't eliminate the cats, you won't see much gain at all. RB systems don't come with cats, and unless you don't have any smog testing in your area, its not worth making a custom exhaust. Most aftermarket high flow cats I hear clog up real fast on a rotary.

But to make a long story short, go custom if you can. Its cheaper, you get a better exhaust flow (if done right), and it will most likely have a nicer sound. Any racing beat exhaust I have hear has sounded like a honda. If you need the cats, don't bother messing around with your exhaust.

 

A rotary with a presilencer and straight through rear muffler will make your ears ring after 5 mins on the highway. I wear earplugs when I drive

 

ahhhh ok. Maybe I chose the wrong car to try and pass emissions, eh? :P Cats are required in my area, so that may be a problem. However, as long as the noise level is below 99 dB, it's legal (even though I wouldn't quite want it that loud.)

However, I would rather that when I do my streetport, I get something out of it. Perhaps if I left the stock system on after I rebuild/streetport my engine, and then pass emissions (hopefully.), it will be worthwhile to make a custom exhaust?

Will running a stock system with a streetport mess anything up, besides not giving me the full potential of the engine?

 

i have a header that collects into 2.5 inch pipe, straight back into the apexi dunk, which is a straight through muffler.. it's the loudest car around... seriously. people pull up beside me all the time telling me it sounds like a highly pissed off bee.. but i eat honda's for breakfast so i don't mind.

 

Well, I highly recommend staying stock if you have e-testing in your area. There are little to no gains to be had with just changing the rear muffler on a rotary. Also, e-testing is what lead to the death of the rotary, along with that shitty twin turbo monstrosity in the FD.

 

I need my catalytic converter because of e-testing here in TX....but my **** converter is whats making my whole system ******* loud as hell right now......look since i need cats i won't be doing anything tooo extensive to my exhaust but if i got that Bonze street exhaust high flow converter system from http://www.rx7.com/store/rx7/saexhaust.html will it make it a little bit more tolerable (and i sometimes smell like exhaust as well after im done driving for a while..... that converter of mine right now is in BAD SHAPE!)

 

Is your converter stock? I highly doubt that the bonez converter will quiet it down much. But if the exhaust is intollerable, I'm not sure if your converter is even there. Its either that or the converter was gutted. I don't have any catalytic converters on my car (no e-test for cars older than 20 years in Ontario) and it stinks all the time. But that just love for the rotary, so I put up with it. Smells like my weed wacker, just 10x worse.

 

yeah my converter is stock.....the whole exhaust system is...ok ok i can live with the loudness (its kinda cool when people look at u and cover thier ears ...hehe)...anywyas yeah i know its my converter gone bad becuase thats the area where the exaust is the loudest and where my exhuast leak is at( I CAN SMELL IT)....i just really want to know if that BONEZ converter system is pretty good to use?

 

I'm not sure if its any good. I have never seen a post on this forum about it, and have no personal experience with it. Others might be able to help you out more than me. I prefer not to think about catalytic converters since I don't need them.

 

I'm from TX and never has E testing. Can you get your inspection out of San Antone? If so, go to a smaller town and get the hook up! Just incase you care, I'm from near Plano... North of Dallas

 

Damn, wish I lived in Ontario. It's 25 years or older here, and I have an '83 . Oh well, I'll just have to make do.

 

hmmmmm. this "strait pipe way too loud" stuff you guys are talking about is not all true. I have headers>straitpipe>strait-flow muffler, and its not really, really loud. yeah, its loud, but it doesnt make your ears hurt. its quiet enough to where I can still talk on my cell phone while driving. My muffler is big though. Heres a pic you can kinda see it

 

mine's bigger....