90FC

Bukwild and Carsaregood, thank you guys for all your help. You guys were a big help. I think I know what I want to do. I'll post up later when I am done with it.

Thanks again guys, I'm out.

90FC

Btw, about the air tube if anyone can answer that question for me that would be great.

Sindregutt

Bukwild, Do you know how many db your exhaust makes?

Aaron Cake

iTrader: (1)

I am currently building exhaust #1 with the mufflers shown in my signature. The Y is made of a 3" section that splits into two 2.5" tailpipes that head down to the mufflers. All is thick walled stainless. The mufflers are "rice" mufflers that I bought about 7 years ago before every 2nd Honda had knock-offs.

When the car was NA I also had the Bonez SuperFlow cat and resonator. The resulting sound was quiet at low throttles but loud at high throttles (just the way it should be). The tone was low with absolutely no "chainsaw" effect or "fart" effect. Many people commented that it was the best sounding RX-7 they had heard.

With the current setup consisting of just a 3" downpipe and 2.5" catback and the muffles (not to mention the bridgeport) I expect the car to be loud.

An NA would be unbearable with just two rear mufflers in a daily driver application.

Edit...Turn on signature...Duh...

Mx6-Rx7 Addict

I don't really think it's bs that most of us posted trying to post other options rather than having to build his own exhaust. From his description regarding the type of characteristics he would like from his exhaust, i simply think that the racing beat system would fullfill his needs. I don't see any reason why implying a company built catback as a good product for someone as "bs to people who don't know actually how to build an exhaust".

No offense to you, just would like to express my opinion.


-Justin

90FC

Can anyone tell me how to hook up the air pump tube to the exhaust?

rotarygod

iTrader: (1)

First of all don't think I am trying to rag on you or start a fight. That's not my intention. However, I do feel the need to correct/agree/elaborate on some things.

True

Not saying you are wrong or right but prove it. Have you personally flow tested them? The way something looks doesn't mean a thing. I have an issue when people claim things like this and can't back it up with any real workd test data. Again, not saying you are wrong. Just be able to back it up with personal testing results. No one else here has ever tested them either so until someone does, this is speculation. It may or may not be true. Comparing comparable mufflers of course.

Absolutely false! It is very possible to have a very free flowing exhaust that is fairly quiet. This is a common misconception that is in the same catagory as thinking that backpressure is needed to make low end power.

The raspiness has a lot to do with the size of the muffler used. Larger typically are not as raspy. The internal design of the muffler also has a lot to do with it. There is nothing special about Magnaflow or Borla in regards to this. You can have a raspy sound with theirs too if you use the wrong ones.

Again with the flow claims with no data to support it. Once again the way it looks doesn't mean anything. I've personally seen things on the flowbench that went totally against common logic from what it looks like it should do. A single is most likely lighter for obvious reasons. Sound is an opinion, and flow is not necessarily improved from one to the other. Again design is a factor. You can get either system to ourflow the other depending on how you do it. One thing to think about is that 2 mufflers have twice the muffling ability of 1.

Battleborn7

Question 1: do you have access to a welder?
Question 2: how does about 350 bucks sound?

Summit racing sells exhaust piping and flanges(Example: 3" tubing 4' length costs about 14.95 per pipe)turbo muffler(3" inlet 3" outlet) costs about 30 bucks

get two 75 dollar connecting pipes from RX7.com and re-route the exhause out one side.

top it all off with a muffler of your choice or set it up as a pre-muffler solution so you can have a straight pipe out the back

anything to help as I am also on a budget(but i also live 2 blocks from summit racing)

Bukwild

Rotary god,

Why don't you get out your pocket flow bench a tell us. I have posted several pictures of how straight through they are. I have personally cut a rb exhaust in half and it was packed with wool. Now if you want to some how claim that a wool packed exhaust flows better than a straight through one feel free to prove everyone wrong. And post some pics.

rotarygod

iTrader: (1)

Racing Beat mufflers are straight through. At least both of mine were so I don't know where you are going with that.

The other point is that pure flow doesn't always mean anything. What if muffler A flows 350 cfm while muffler B flows 500 cfm (assuming a standard nominal test pressure). Does that mean that muffler B makes more power? Maybe. What if our engine flows a max of 340 cfm? Now which one makes more power? See the issue? If the engine needs 400 cfm of flow than sure muffler B will do better. It doesn't take so much before it's not a restriction. What if we have a non straight through muffler that flows 400 cfm? Is that a restriction compared to a straight through that flows less? Obviously tubing size would be a deciding factor in this but you get the idea.

Straight through does not always imply good flow. A good muffler like a Dynomax or Magnaflow will flow nicely because they are perforated core. Go look at a louvered straight through muffler. Worse flow than many chambered mufflers even though you can see straight through them.

Then you have other efects on the exhaust such as what the engine "sees" in regards to mufflers. A straight through is viewed by the engine as an extnsion to the exhaust length whereas a chambered muffler is "invisible" from a length standpoint and doesn't contribute to resonant tuning in the same way. These effects may or may not be great but the point is that there are differences.

A quiet chambered muffler is not a restriction if it flows more than the engine flows. Therefore while on a static test bench a quieter muffler may be a restritcion, in practicem it may not be. I stick to my story. You admit that you are just looking at cut open mufflers to make your assumption that one is better by virtue of how you feel it compares visually to the other one. However there is no information anywhere as to what the engine actually requires. The Magnaflows many in fact flow better than any Racing Beat muffler all else being equal but without an actual test result combined with knowing what the engine actually needs, it's just speculation and logic based on looks doesn't always work when it comes to flow.

Again I'm not trying to start a fight or make you look bad. I do feel that you did take offense to it though and for that I am sorry. I tried to include a disclaimer but apparently it went unnoticed.