LocostUSA.com

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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Honey anyone?

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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Steve

My build : http://www.locostusa.com/forums/viewtop ... 35&t=17160

MGB/GT V8 5.0L. viewtopic.php?f=36&t=20782

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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My build: http://www.locostusa.com/forums/viewtop ... 18&t=13096


You can build the most awesome thing in the world but at some point, an 80yr old man in a crx is probably going kick your butt on the track... don't ask me how I know.

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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Steve

My build : http://www.locostusa.com/forums/viewtop ... 35&t=17160

MGB/GT V8 5.0L. viewtopic.php?f=36&t=20782

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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Larry in Seattle

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 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

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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Steve

My build : http://www.locostusa.com/forums/viewtop ... 35&t=17160

MGB/GT V8 5.0L. viewtopic.php?f=36&t=20782

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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mobilito ergo sum
I drive therefore I am

I can explain it to you,
but I can't understand it for you.

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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My build: http://www.locostusa.com/forums/viewtop ... 18&t=13096


You can build the most awesome thing in the world but at some point, an 80yr old man in a crx is probably going kick your butt on the track... don't ask me how I know.

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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2015 & 2016 EMod Florida State Autocross Champion
2013 & 2014 DSP Florida State Autocross Champion

Scrap Metal Build Log viewtopic.php?f=35&t=14558

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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Larry in Seattle

I may as well try your old one.

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Steve

My build : http://www.locostusa.com/forums/viewtop ... 35&t=17160

MGB/GT V8 5.0L. viewtopic.php?f=36&t=20782

Turbocharger and no muffler here

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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Midlana book: Build this mid-engine Locost!, http://midlana.com/stuff/book/
Kimini book: Designing mid-engine cars using FWD drivetrains
Both available from https://www.lulu.com/

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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Chuck.

“Any suspension will work if you don’t let it.” - Colin Chapman

Visit my ongoing MGB Rustoration log: over HERE

Or my Wankel powered Locost log : over HERE

And don't forget my Cushman Truckster resto Locostusa.com/forums/viewtopic.php?f=36&t=17766

I wear a helmet

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

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My build: http://www.locostusa.com/forums/viewtop ... 18&t=13096


You can build the most awesome thing in the world but at some point, an 80yr old man in a crx is probably going kick your butt on the track... don't ask me how I know.