Exhaust

[mx3freakit]

:p The local muffler shop in Topeka, Kansas is a MagnaFlow dealer and he got me a muffler for retail price and didn't charge much at all for labor. It took only 45 minuets to put on. His info on his shop is at <A HREF="http://www.magnaflow.com/04dealer.htm" TARGET=_blank>http://www.magnaflow.com/04dealer.htm</A> give him a call if you live near Topeka,KS USA and he will give you a deal. The ZIP code is 66606. The shop is The Muffler Shop.<p>[ August 18, 2002: Message edited by: Magnaflow ]

[aznwithamx3]

i just got mine done for 100 bucks!it was expensive.the guy said he was gonna take a look at it so i went the store across the street for about 45 minutes.came back to the shop and the muffler is already on!i looked under the car and all i saw were clamps and no weeldings!wtf! does carx weld the muffler on and then clamp it from going anywhere or something?if it was just clamped on then i want my money back!

[92RedMX3]

Yeah, they will just clamp it on, cause welding takes time and skill.

[canadian_ice]

Boys boys boys! Take a look at where people are from before saying they got ripped off, or got something for cheap. CDN and US $'s are quite different. [img]shrug.gif"%20border="0[/img]

[Casino]

well said ice

[Freq2002]

Here's something I came across for those out there like myself that left out the resonator/pre-muffler when they upgraded the system. There is a way to deaden the sound of your land bound aircraft engine,...<BR>Found out that a few of the street & custom shops are using full flow glass-packs for pre-muffs. Good 'ol Cherry Bomb available at most auto parts shops, costs about $25 USD. I got one for my car, just have to get it welded in. Will let y'all know what the cesna sounds like after.<P>Also, I found out that with custom cat-back systems that are welded on, you dont have any flex in the system & run the risk of cracking the pipes at the header flange. That little 10-12" piece of stainless steel tube that runs from the header & curves down to the cat, ONLY available from Mazda, & for a mere $220. Got two words for that, the second one is "no",...<BR> I'm having the bottom of my stock pipes opened up, & using the section of tube that will need to be cut out for the Cherry Bomb, make a new down pipe & install a stainless steel flex joint. After that, should be good for a few years.

[Timmyd865]

what is the deepest coolest sounding exahaust system? I like deep low sounds... w/out the stupid bumble bee sound at high RPM'S. What muffler is the best? And having a DOHC how much can i expect to gain out a catless exahaust and a good muffler? thanx

[Custommx3]

I wouldnt remove the cat, you loose some back pressure, never remove the resonator, or you exhaust gets LOUD. Its a preference thing. A 4cl is going to be higher piched than the v6. <BR> <A HREF="http://www.barrykclark.com/pix/movies/" TARGET=_blank>http://www.barrykclark.com/pix/movies/</A> <P>there you will find some moves of Paul and I's cars. We both have OBX mufflers and a similar design.<BR>He has the stock setup on a KLZE with an aftermarket muffler, I have cat back pipping(2") and removed resonator ( it was my ignorance that told him to cut it off, regretting it later, installed another inline muffler to quiet it down.)<P>You'll notice my exhaust is low toned as so is his at idle, but Paul has a V6, KLZE, which produces a completley different sound all together. <P>I plan on moving it over to my GS, which is why I got the 2" exhaust. <P>And RS and a GS sound completley different, even with a similar setup. (plus my RS is an auto, His ZE is a stick.)

[tk1138]

you dont' want/need back pressure, you do want velocity.... Drag is reduced significantly when reynolds number is about 10^6. A high flow cat will help velocity vs. regular cat. <P>Not using a cat is bad for the environment, and illegal, will probably increase deposits on the inside of your exhaust, but might give some/temporary preformance boosts over stock.<P>I suspect using a resonator+preformance muffler would be the optimum noise reduction/preformance combination for street legal cars.

[Custommx3]

i agree in some sense, but our motors requires some backpressure to run correctly. The mx-3 cat is a pretty free flow cat as well, compared to most.

[ProtegeSTS]

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by Custommx3:<BR><STRONG>i agree in some sense, but our motors requires some backpressure to run correctly. The mx-3 cat is a pretty free flow cat as well, compared to most.</STRONG><HR></BLOCKQUOTE><P><BR>Wrong. Backpressure is NEVER good, in ANY amount. The issue is that if you make the pipe so big as to not have any backpressure, you also have really bad velocity. <P>Backpressure is a side effect of a well tuned system.<P>Also, the "engine sound" of a car is mostly determined by the Intake manifold. This is why the B6 and the K8 sound so different.

[Custommx3]

Modern engines require "backpressure to make the EGR system to reduce the emmisions in the catylitic converter. <P>No engine (fuel injected or otherwise) needs exhaust backpressure. To optimise the exhaust flow of the system, the system is designed with a vacuum (negative pressure) in the exhaust pipe to pull the flow through the pipe.<P>Read Chapter 8 of "Engineering Fundamentals of the Internal Combustion Engine" by Willard W Pulkrabek.

[ProtegeSTS]

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by Custommx3:<BR><STRONG>Modern engines require "backpressure to make the EGR system to reduce the emmisions in the catylitic converter. <P>No engine (fuel injected or otherwise) needs exhaust backpressure. To optimise the exhaust flow of the system, the system is designed with a vacuum (negative pressure) in the exhaust pipe to pull the flow through the pipe.<P>Read Chapter 8 of "Engineering Fundamentals of the Internal Combustion Engine" by Willard W Pulkrabek.</STRONG><HR></BLOCKQUOTE><P>EGR systems are for emissions, not making power. Many people on this board have blocked it totally, because of its negitive effects.<P>You cannot use pipe lengths and diameters alone to get negitive pressure in the system. That can only be done at the collectors, where you can start playing with the pulse waves to "pull" out the exhaust gases.<P>Your little quote just backed up what i had to say and went against what you did...why do I have to read Chapter 8? Maybe you should REREAD it.<P> [img]shrug.gif"%20border="0[/img]

[Custommx3]

Step 1 Do you have the book in question?<P>Step 2 Yes creating the vacuum does require setting up a series of pulse waves in the exhaust pipe. <P>This type of exhaust tuning is only applicable to a small range of rpm. For example if you tune the exhaust for 5000 rpm then you have setup the pulses for that exhaust flow. However this is counter productive if you do not run constantly at this rpm.<P>Also note that anytime your exhaust opening (pipe diameter, cat throat,etc.) is larger than your exhaust valve diameter you will not have a backpressur problem.<P>This the the case with any aftermarket cat or, muffler. Also having 4" pipes on almost any engine but a diesl is crazy. Enough Said. <P>Incidently I have taken that class, been there-done that.

[Timmyd865]

what is a good quite close to stock sounding muffler and how much would it cost?