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#851433 - 02/04/11 01:06 AM Re: Mufflers? [Re: Bo]  
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Snowboi Offline
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Fort Walton Beach, FL
I run dual 3" with flowmaster 40's, it sounds perfect to me, with my cam and all, it is deep and louad when its needs to be. I've never been a person to like loud and noisy glass packs, ytes, i know you can add mufflers befind them, but it still would be loud, I'm more into the deepness of the base, just like when I would start my SS up sometimes in the morning (inbetween my neighbors and my house) it would shake both houses if at the right RPM.

Every engine will sound different, so your basicly rolling the dice like Mark (MAP) said.

Good luck.

#851436 - 02/04/11 01:15 AM Re: Mufflers? [Re: Bo]  
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Bad86SS Offline
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Kentucky
i have a comp 280h cam, so we'll sound similar. thanks! mine is loud, but its no longer my DD. it definitely turns heads, which is what the car is built for. it's my "foxbody killer" haha


#851438 - 02/04/11 01:16 AM Re: Mufflers? [Re: Snowboi]  
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cuzr84 Offline
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california, MO
Mine are true duals with Cherry Bomb Vortex. I believe it is 2 1/4" pipe. I like the sound of them. They were on it when I bought it last year it had the big chrome tips on it also. Since I have never cared for the tips I cut them off. Its not real loud and has gotten compliments on it.

#851456 - 02/04/11 02:38 AM Re: Mufflers? [Re: cuzr84]  
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Aaron88SS Offline
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SS Indpls, In
I run 2 1/2 true duals no cats with 40series. I'm using manifolds not headers and it sounds great not to loud but gets plenty of attention. I just seen a video of pypes violators and I'm thinking of making a switch they sound awesome and they are cheap.


87 SS- 355 c.i.d 750 Holley DP Malorry ignitions Lakewood suspension W.I.P (Was lost but Now she is found)
88 ss- T-Top 327 c.i.d 2inch goodmark Steel Cowl. 40 series true dual Needs More Power...






#851514 - 02/04/11 01:26 PM Re: Mufflers? [Re: Aaron88SS]  
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RDKLXPRS Offline
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Lexington, NC; Daytona Beach, ...
The exhaust i want to do is Flowtech Afterburner Turbo-chamber headers with an h-pipe and Warlock racing mufflers.

1. i have no idea what it will sound like
2. Probably not happening anytime soon


[Linked Image]
1986 MONTE CARLO SS 5.7L 440,000 mi.
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#851527 - 02/04/11 02:24 PM Re: Mufflers? [Re: RDKLXPRS]  
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justgettinby Offline
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muskogee, oklahoma
is there such a thing as a quiet proformance muffler???
ive heard dynomax flows like straight pipes and not super loud

#851536 - 02/04/11 04:04 PM Re: Mufflers? [Re: justgettinby]  
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MAP Offline
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MAP  Offline
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Hi just,

Maybe this is a good time for me to say that my favorite exhaust system is one I can't hear at all. I want my drivetrain to "speak" to me through significant g's of acceleration, and not 105dB of noise that advertises like a PA system to everyone within a 1/2-mile radius, that I want to go fast.

That said, I know many here feel otherwise, and that's fine.

So, what are the key elements of a quiet exhaust system?

1.) Volume. The bigger, the better.
2.) Discretization. For a given volume, dividing elements in the chain and putting them in series, is more effective than having just one muffler. Try to combine with a collector "termination box," to help engine performance and reduce noise.
3.) Cross-coupling between both sides of exhaust system.
4.) Exit location as far as possible from driver's ears.
5.) The exhaust pipes themselves offer a measure of noise attenuation - see Buzz's earlier comments about muffler location.
6.) Radiating area - the smaller, the better (of course this hurts engine power, which is why we struggle with other factors.)
7.) Motor displacement: the smaller, the better. Ditto the cam: the smaller, the better. (See comment in 6.)
8.) Interior noise barrier treatment: mass is unbeatable as an LF noise barrier. At higher frequencies, passive absorption is the method of choice.
9.) Finally, if it has to be very quiet but not at all inhibitive of maximum engine power, consider an adaptive system that gets loud only when the motor needs to make a lot of power. The Corvette NPP exhaust does this, as well as any system that uses "cutout" valves that respond to engine output in some kind of "intelligent" way.

Now justgettinby, if your immediate question is something like: OK - I've got so much space for a muffler, and so much diameter of exhaust pipe committed, what is the quietest muffler? The answer is the biggest box you can fit, and filled with absorptive material, most likely "roving" fiberglass, with a central pass-through tube of the same or greater diameter as the exhaust pipe, and full of perforations to yield the tube acoustically transparent to the passage of acoustic pressure. Walker Ultraflows qualify in this regard, but there are probably other companies offering something similar.

That's it! The approach of using boxes with all kinds of improbable internal baffles with allegedly magical acoustical or flow properties, is just so much hype - sorry. Most often, the effect is to hurt flow more than it is to attenuate noise.

HTH,
MAP

Last edited by MAP; 02/04/11 04:14 PM.
#851551 - 02/04/11 06:06 PM Re: Mufflers? [Re: MAP]  
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justgettinby Offline
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muskogee, oklahoma
map are we limited on size in the stock location im still thinking dynomax turbo just not sure of size

#851552 - 02/04/11 06:08 PM Re: Mufflers? [Re: MAP]  
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4893fei Offline
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Ok so would adding cherry bombs on the headers,Make it louder or would it quiet it down...

#851566 - 02/04/11 07:33 PM Re: Mufflers? [Re: 4893fei]  
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MAP Offline
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MAP  Offline
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Yuma, AZ
Hi Folks,

I have very little to say about specific muffler models - I'm sure others here could help more. I've gone with Walker products in the past since their construction matches what I've discussed here, and because they are one of the very few companies (or even the only company?) that publishes CFM ratings for their mufflers. Another reason is that they were the only company that was directly responsive to acoustics questions and suggestions on my part.

HTH,
MAP

Last edited by MAP; 02/04/11 07:35 PM.
#851567 - 02/04/11 07:44 PM Re: Mufflers? [Re: MAP]  
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BuzzLOL Offline
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Toledo, Ohio
.. A few years ago on my Cadillac I replaced the $90 front muffler with a $15 turbo muffler and the $60 rear resonator with a $15 turbo muffler and was surprised it came out totally silent... quieter than the stock system...


'86 Monte LS (total'd Fall '2013), '87 GTA TransAm TPI350 TH700-R4, '85 Fiero 5-speed, '75 MG Midget Buick Alum.V8 BW 5-speed manual, '77 Pontiac Astre Formula wagon 5-speed posi, '78 F150 4WD 351"M ==> 400" C6, '79 Caddy Seville Olds EFI 350" TH400, 19' Slickcraft 425HP 351W MerCruiser I/O
#851575 - 02/04/11 09:26 PM Re: Mufflers? [Re: BuzzLOL]  
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406monte Offline
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Hubert, NC
I am running a 406 with Flowtech full length headers and 2 1/2" exhaust with an H-pipe into 30 series Flowmasters. You are going to see a big difference in the sound of a car with the same exhaust system on two different cars. This is due to the motors being totally different compression, cam, carb, and even the size of the motor. Here is a sound clip of mine.


84 Monte Carlo SC 406 SBC
78 Monte Carlo 305 sbc SOLD
78 Monte Carlo Landua 350 sbc SOLD
81 Malibu Classic 350 sbc SOLD
84 Monte Carlo LS 350 sbc SOLD
84 Buick Regal 229 v6 SOLD

#851580 - 02/04/11 10:25 PM Re: Mufflers? [Re: 406monte]  
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00r1sc Offline
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Jacksonville, NC
Eric, I finally got to hear your beast running. Sounds a little different than mine!!! LOL


"WE DO NOT ACCEPT APPLICATIONS ONLY COMMITMENTS"
"Opportunity is missed by most people, because it is dressed in overalls and looks like work" Thomas Edison

It's better to be fast on a slow bike than slow on a fast bike!!
#851583 - 02/04/11 11:13 PM Re: Mufflers? [Re: 00r1sc]  
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MAP Offline
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MAP  Offline
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Hi Folks,

These last few posts really highlight the fact that the engine in front of the exhaust system, and not just the exhaust system, has a tremendous impact on sound quality.

Best,
MAP

#851584 - 02/04/11 11:25 PM Re: Mufflers? [Re: MAP]  
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406monte Offline
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David, should have shown you that a while ago. I almost forgot about it. Yea, it is slightly different sounding. poke

Map, you definitely hit the nail on the head. The motor is what dictates the sound of most cars. I have a .558 roller cam in mine. When I changed carbs on it it also change the tone of the car in idle and in when the throttle hits the floor. Something to think about.


84 Monte Carlo SC 406 SBC
78 Monte Carlo 305 sbc SOLD
78 Monte Carlo Landua 350 sbc SOLD
81 Malibu Classic 350 sbc SOLD
84 Monte Carlo LS 350 sbc SOLD
84 Buick Regal 229 v6 SOLD

#851599 - 02/05/11 12:50 AM Re: Mufflers? [Re: 406monte]  
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Hey-O Offline
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St. Charles Mo
That sounded and looked extremely sweet to me , very well done Eric . I have a 406 with 3 inch FlowTech Warlock mufflers . They dump down just in front of the rear end under the car . My car sounds like Ericís but a little louder . Iím sure my new 383 at 500 hp has a cam that will totally change the sound . Eric and Map are right ÖÖÖ 500 hp LS engine would sound totally different . 500 hp is 500 hp . but thereís nothing like an old school cam to sweeten up the sound ÖIMO . Itís the only reason I went this way Ö..


... " HEY - O " ... LET THE HORSES RUN

#851608 - 02/05/11 01:49 AM Re: Mufflers? [Re: Hey-O]  
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00r1sc Offline
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Jacksonville, NC
Eric, now we just need to finish all the final touches on your car so I can here live instead on the computer.


"WE DO NOT ACCEPT APPLICATIONS ONLY COMMITMENTS"
"Opportunity is missed by most people, because it is dressed in overalls and looks like work" Thomas Edison

It's better to be fast on a slow bike than slow on a fast bike!!
#851609 - 02/05/11 01:49 AM Re: Mufflers? [Re: Hey-O]  
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Bad86SS Offline
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Kentucky
Originally Posted By: Hey-O
but thereís nothing like an old school cam to sweeten up the sound ÖIMO . Itís the only reason I went this way Ö..

thats my point of view. my age group doesnt see it though. they love the 140hp 4 banger sound smirk


#851614 - 02/05/11 02:21 AM Re: Mufflers? [Re: Bad86SS]  
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406monte Offline
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Bad that is typical of the youth today. They don't respect the older cars and the lack of technology. I guess there isn't enough buttons and gadgets for them. They look and think twice when they get their butts spanked at the race track though. For some reason they think those fart cans make their cars sound mean and add hp. But, they are sadly mistaken.

Hey-O thanks for the compliments. I love the sound of an old motor with a really chompy cam in it. I think it just says hey look at me I'm old school muscle. That 383 ought to sound real nice with those numbers it makes.

David, I know what you mean. I am actually getting anxious now to get it done. If it weren't for scraping for the Grand Am, I would have dumped all that money on the car and had it almost done.


84 Monte Carlo SC 406 SBC
78 Monte Carlo 305 sbc SOLD
78 Monte Carlo Landua 350 sbc SOLD
81 Malibu Classic 350 sbc SOLD
84 Monte Carlo LS 350 sbc SOLD
84 Buick Regal 229 v6 SOLD

#851694 - 02/05/11 05:02 PM Re: Mufflers? [Re: 406monte]  
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Mnt86ss Offline
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Newburyport , MA
The exhaust Im aiming for is Hooker comp headers with a 3" collector, Spintech 3" X pipe into 2 Spintech super pro street 9000 series mufflers dumped close to the axle


America, Love it or leave it

#851701 - 02/05/11 05:35 PM Re: Mufflers? [Re: Mnt86ss]  
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MAP Offline
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Hi Folks,

Again - this highlights the matter of the subjectivity of sound perception. One person's music is another person's noise, and vice-versa. About the sound that emerges from the tail pipes: the engine and exhaust system share more-or-less equal responsibilities here. Put a lawnmower engine in front of a free-flowing exhaust system, and chances are you won't even hear it. Put a 1,000 hp beast in front of an exhaust system that's plugged-up, and you won't hear that either.

Of course, all the "fun" occurs with dealing with the enormous range between these two extremes...

I'm glad that we've made headway in this thread to establish a broad understanding of this; most threads simply devolve into, "Company's X stuff sounds awesome, get that!"

Best,
MAP

#851712 - 02/05/11 06:37 PM Re: Mufflers? [Re: MAP]  
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Hey-O Offline
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St. Charles Mo
The exhaust system I have now will be replaced for a system that exits out the back . The dumps under the car echoes or bounces the sound around under the car . Itís louder and does a nice job of cleaning the street under my car while throwing it up on my clean new bottom side .. LOL . My car had glass-packs on it years ago that sounded nice to me , but when I was a kid that was the only way to go . All these new mufflers have a way of throwing sound in different tones . Nothing is more straight through then a glass-Pac and they are still not as loud as what I have now . There engineered for different tones for many different tastes . I think the pop of my new cammed up engine will allow me to go with a little quieter muffler and still have a rich deep tone which is what Iíll be looking for . Iím sure the added tail pipes will help calm things down all by itís self . Time will tell ÖÖ.


... " HEY - O " ... LET THE HORSES RUN

#851765 - 02/05/11 09:49 PM Re: Mufflers? [Re: MAP]  
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Houlie Offline
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Originally Posted By: MAP
most threads simply devolve into, "Magnaflow's stuff sounds awesome, get that!"


Fixed it for you thumbs

#851790 - 02/06/11 12:02 AM Re: Mufflers? [Re: Houlie]  
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MAP Offline
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That was a good chuckle - thanks! Best - MAP

#851829 - 02/06/11 02:36 AM Re: Mufflers? [Re: Houlie]  
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BuzzLOL Offline
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Originally Posted By: Houlie
Originally Posted By: MAP
most threads simply devolve into, "FLOWMASTER's stuff sounds awesome, get that!"


Fixed it for you thumbs



.. Wasn't that what you meant... smile


'86 Monte LS (total'd Fall '2013), '87 GTA TransAm TPI350 TH700-R4, '85 Fiero 5-speed, '75 MG Midget Buick Alum.V8 BW 5-speed manual, '77 Pontiac Astre Formula wagon 5-speed posi, '78 F150 4WD 351"M ==> 400" C6, '79 Caddy Seville Olds EFI 350" TH400, 19' Slickcraft 425HP 351W MerCruiser I/O
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