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 Post subject: Re: Quieter exhaust
PostPosted: June 7, 2014, 11:34 pm 
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Joined: February 8, 2014, 10:47 pm
Posts: 492
Location: Cornholio OR "Where the magic happens"
Flowmaster has some mufflers with extra chambers I think they are or used to be the 70 series mufflers.

They have a large built in resonator.

Also always use a turn down exit, by itself gives a significant reduction.

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 Post subject: Re: Quieter exhaust
PostPosted: September 1, 2017, 1:20 pm 
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Joined: August 8, 2014, 6:08 pm
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Location: Green Bay, WI
So has anyone had any experience with the Magnaflow 4" round since this post. I've been lookin at their 2.5" x 4.

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 Post subject: Re: Quieter exhaust
PostPosted: September 1, 2017, 2:30 pm 
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Joined: October 13, 2011, 9:19 am
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Location: Denver Co
Tundra 7 wrote:
So has anyone had any experience with the Magnaflow 4" round since this post. I've been lookin at their 2.5" x 4.



Yes and you can have the one i just took off (just pay for shipping). Its a bit heavier than my new one but they sound about the same. I'm not sure which creates more power since i didn't "feel" a loss or anything. Does that help?

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 Post subject: Re: Quieter exhaust
PostPosted: September 2, 2017, 1:25 am 
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Location: Green Bay, WI
mjalaly wrote:
Tundra 7 wrote:
So has anyone had any experience with the Magnaflow 4" round since this post. I've been lookin at their 2.5" x 4.



Yes and you can have the one i just took off (just pay for shipping). Its a bit heavier than my new one but they sound about the same. I'm not sure which creates more power since i didn't "feel" a loss or anything. Does that help?

So did you put the same kind on again? Are they loud? Do they have a deeper tone like I imagin them to? What where you tying to achieve in the change?

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 Post subject: Re: Quieter exhaust
PostPosted: September 2, 2017, 4:13 am 
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Joined: December 24, 2007, 5:11 am
Posts: 902
Location: Seattle area
Steve,

That's the muffler I have on my Toyota 20V 4AGE. Originally it was quite loud. My wife wouldn't ride in the car because of this. I added a baffle inside that quieted it down to an acceptable level but it also took some HP. Not sure how much but it doesn't seem as spunky as it was before.

I was talked out of Borla. Really don't have a recommendation. On the plus side the Magnaflow has a great sound both before and after the baffle.

Cheers,

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 Post subject: Re: Quieter exhaust
PostPosted: September 2, 2017, 8:18 am 
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Joined: September 22, 2005, 8:12 am
Posts: 1613
Location: 4AGE in S.E. Michigan
Larry
The 4AGE does seem to be louder then most other 4 cylinder engines. I finely bit the bullit and installed a rear mount exhaust. Why I did not do this years ago :BH: Just routing the pipe to the rear made a big difference. I then installed a M/C add-on muffer. Made a world of difference is the sound and loudiness. For the pipe bend going under the frame, I took a "Y" section out of a std 90*, forming a sharper bend, plus increased the tubing one size to maintain the section area. I also flaten the tube into an oval to increase ground clearance. After angling back and clearing the rear horizontal frame tube I converted back to the std tubing size. Dave W


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 Post subject: Re: Quieter exhaust
PostPosted: September 2, 2017, 8:45 am 
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Joined: August 8, 2014, 6:08 pm
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Location: Green Bay, WI
Dave that's nice. I have a buddie that is really warning me about leaving the exhaust open at the rear wheel and to run it back like you did. What are the hangers? I've never seen those. They look like they work well.

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 Post subject: Re: Quieter exhaust
PostPosted: September 2, 2017, 1:58 pm 
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Location: Fort Worth, Texas
I'll say it again, BORLA!

Single in and dual out.

It gives the best sound of any muffler I've ever had. And this way you get to run cool dual pipes to finish it out

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 Post subject: Re: Quieter exhaust
PostPosted: September 2, 2017, 2:27 pm 
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Joined: October 13, 2011, 9:19 am
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Location: Denver Co
Tundra 7 wrote:
So did you put the same kind on again? Are they loud? Do they have a deeper tone like I imagin them to? What where you tying to achieve in the change?


I went from the standard 4" round Magnaflow to the Moroso Spirol Flow.

I can't really speak for noise since my car is a high rpm 4cyl turbo whick always sounds like a crotch rocket but I can hear the turbo spool really well and no one notices the noise, even the neighbors when I take her to work at 5am.

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 Post subject: Re: Quieter exhaust
PostPosted: September 2, 2017, 4:23 pm 
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Joined: December 7, 2012, 8:28 am
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Location: Sarasota
I am really happy with my Dynomax (17747). It is quiet enough to never have an issue with sound at an event but still gives you that engine sound.
https://www.youtube.com/watch?v=R8tIO7RJALQ

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 Post subject: Re: Quieter exhaust
PostPosted: September 2, 2017, 4:25 pm 
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Joined: December 24, 2007, 5:11 am
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Location: Seattle area
Dave,

Thanks for the reply and pics. Haven't seen your car however spent some time riding with Graham Earley and his exhaust runs to the rear and much quieter than mine and we both have the 4AGE. I was seriously considered routeing mine that way but just can't see a way to do it. Too much frame in the way.

Another of the drawbacks of using the Miata rear sub frame.. Can't safely go under it. Another fine mess I got myself into.

Like your heat shield. Where did you source that?

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 Post subject: Re: Quieter exhaust
PostPosted: September 2, 2017, 5:04 pm 
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Joined: August 8, 2014, 6:08 pm
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Location: Green Bay, WI
mjalaly wrote:
Tundra 7 wrote:
So did you put the same kind on again? Are they loud? Do they have a deeper tone like I imagin them to? What where you tying to achieve in the change?


I went from the standard 4" round Magnaflow to the Moroso Spirol Flow.

I can't really speak for noise since my car is a high rpm 4cyl turbo whick always sounds like a crotch rocket but I can hear the turbo spool really well and no one notices the noise, even the neighbors when I take her to work at 5am.

I may as well try your old one.

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 Post subject: Re: Quieter exhaust
PostPosted: September 2, 2017, 5:32 pm 
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Joined: April 23, 2006, 8:26 pm
Posts: 5971
Location: SoCal
Turbocharger and no muffler here :P

Even if I had a perfectly quiet muffler, the wind whipping around the sides of the windshield and hitting my ears is enough that I always drive with foam earplugs.

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 Post subject: Re: Quieter exhaust
PostPosted: September 2, 2017, 6:35 pm 
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Location: West Chicago,IL
FYI, A few years back, I measured the road/wind noise at 45 MPH with a noise meter. I pushed in the clutch, and let the engine idle. The noise measured 90-93dBA at the driver's ears. (exhaust on passenger side) Hearing protectors are required above 90dBA fr the workplace and in some cases, as low as 85dBA. I know from experience that driving above 45 MPH will add significantly to that level as does a crosswind.

I always wore hearing protection on the highway ( in my outboard ear so I could still hear my passengers and traffic around me) and also carried a spare pair for any passengers. It was even louder on the exhaust side of the car.

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 Post subject: Re: Quieter exhaust
PostPosted: September 2, 2017, 7:55 pm 
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Joined: October 13, 2011, 9:19 am
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Location: Denver Co
I wear a helmet

Damn squeeky brakes!!
https://youtu.be/uz6qh-ifc9I

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