What is the quietest 3" straight through muffler I can get? - Miata Turbo Forum - Boost cars, acquire cats.

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Old 09-17-2008, 01:45 PM   #1
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Default What is the quietest 3" straight through muffler I can get?

My 3" with the megablaster on the back. IS DEAFENING! All the teenagers at my little brother's school love it!
I let him be the man and drive it to school. He was letting the BOV blow off and showing off.

Anyhow. I'm 30, I don't want to wear ear plugs everywhere. I love the response of the 3". But I need to quieten it down.

I wouldn't care if it was silent at this point. But I doubt that will happen.

I prefer it as quiet as possible, but free flowing and straight through.

Which is the quietest straight through 3" muffler.
Does a resonator help much?

I need to swap the muffler this weekend.

Thanks.
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Old 09-17-2008, 01:52 PM   #2
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lol

You need to do some research on how mufflers reduce sound. Resonators and glasspacks reduce sound through absorption. They will help. General rule is have at least 12" of straight pipe before the exhaust exits the car to make it quiet. Hard to do, but helps.

I have a magnaflow and it's too loud. I'm gonna swap to some muffler that actually has baffles in it. I don't care if it hurts spool a spec. It's too loud the way it is now. (and I have 3 long *** glasspacks before the muffler)
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Old 09-17-2008, 01:54 PM   #3
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Ooooooops, I guess I hit the back key. I thought is was in a different section. Please move or erase, Thanks.
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Old 09-17-2008, 02:01 PM   #4
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Quote:
Originally Posted by patsmx5 View Post
lol

You need to do some research on how mufflers reduce sound. Resonators and glasspacks reduce sound through absorption. They will help. General rule is have at least 12" of straight pipe before the exhaust exits the car to make it quiet. Hard to do, but helps.

I have a magnaflow and it's too loud. I'm gonna swap to some muffler that actually has baffles in it. I don't care if it hurts spool a spec. It's too loud the way it is now. (and I have 3 long *** glasspacks before the muffler)
I feel ya. I have a 3" with no cat and a fart can. It has baffles, but it is insane loud. I'm going to buy earplugs for when I drive it.
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Old 09-17-2008, 02:06 PM   #5
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If you can fit it, the 5x11x22 magnaflow is pretty large and straight-thru.
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Old 09-17-2008, 02:07 PM   #6
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Quote:
Originally Posted by TurboTim View Post
If you can fit it, the 5x11x22 magnaflow is pretty large and straight-thru.
It fits on an NB. That's the one I'm running. It's mounted at a 45* instead of 90* way it is stock.
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Old 09-17-2008, 02:13 PM   #7
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cat + "bullet resonator" + 22" magnaflow = 30 year old compatibility.



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Old 09-17-2008, 02:15 PM   #8
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I had a Magnaflow oval plus a 22" resonator on my SE-R and it was too loud with too much droning. I switched to a Borla oval and even without running a resonator its much quieter and the drone is all gone. Both systems used 3" tubing from the same company (VRS).
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Old 09-17-2008, 02:17 PM   #9
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Quote:
Originally Posted by y8s View Post
cat + "bullet resonator" + 22" magnaflow = 30 year old compatibility.

this formula is winner.
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Old 09-17-2008, 02:22 PM   #10
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Having a catalytic converter makes all the difference. Sounds better and is quieter. But they add backpressure. I have no catalytic converter. I suspect if I did (not that it would fit), the car would sound stock though.
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Old 09-17-2008, 02:40 PM   #11
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even without a cat, im happy enough with my resonator/muffler combo.

The key is the largest muffler can you can fit. Going from a 5x8x14 to a 4x9x14 made a big difference in the overall dB level of my exhaust. The 4" depth doesn't give the sound waves enough room to bounce around and cancel out. Enough so I had to add the resonator to get it back within acceptable levels. Stuff the biggest physical straight through muffler you can manage to fit and you'll be happy. That and never let the wastegate open
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Old 09-17-2008, 03:07 PM   #12
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I have a new 3" 400 honey comb cat for my truck in the closet. I thought about throwing it on there. But I changed my mind.

How big of a muffler will fit in the NA?

I guess I need to go to my muffler shop and see what type of deal I can work. I want a muffler nice and new in the box, off craigs list of course. lol
I quess I'll search here and on CL for a magnaflow or borla.
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Old 09-17-2008, 03:18 PM   #13
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if you want a Magnaflow muffler use performancepeddler.com they are the largest online magnaflow dealer and give you the absolute lowest prices.

look at y8s' car above.
you can fit the 5x8x18 in there no probelm, you just need to start getting creative....example:


actually I like this better than the typical two 90* bends.

vs my standard 5x8x14:



and my now 4x9x14:



you has plenty of room to work with...
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Old 09-17-2008, 03:23 PM   #14
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Cool,
What type of resonator do I need? Or does name brand not matter?
Thanks
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Old 09-17-2008, 03:39 PM   #15
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dynomax bullet race muffler. it's aluminized and about $40. straight through perf (not louvered) core.
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Old 09-17-2008, 04:32 PM   #16
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Mine is bigger than all of you Peewees. 5x8x22" x 2.5" dia. 39 y.o. with very good hearing (audiophile type), but I do have a 200 cell Maremont metal cat. It's quieter than any aftermarket system I've heard yet.

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Old 09-17-2008, 04:34 PM   #17
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Quote:
Originally Posted by Braineack View Post
The key is the largest muffler can you can fit. Going from a 5x8x14 to a 4x9x14 made a big difference in the overall dB level of my exhaust.
You mean the 5x8 was quieter than 4x9, correct?
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Old 09-17-2008, 04:38 PM   #18
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Quote:
Originally Posted by patsmx5 View Post
lol

You need to do some research on how mufflers reduce sound. Resonators and glasspacks reduce sound through absorption. They will help. General rule is have at least 12" of straight pipe before the exhaust exits the car to make it quiet. Hard to do, but helps.
I'm intrigued. Can you explain this 12" rule? Where you got it from?

Quote:
I have a magnaflow and it's too loud. I'm gonna swap to some muffler that actually has baffles in it. I don't care if it hurts spool a spec. It's too loud the way it is now. (and I have 3 long *** glasspacks before the muffler)
Quiet as my car is, I considered this system:

http://autospeed.com/cms/article.html?&A=0883

A butterfly valve after the muffler, that is very partially closed in vacuum, and opens under boost. The partially closed valve will only add 1-2psi of backpressure during cruise, and significantly reduces noise (IIRC > 8 dB in their testing!)
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Old 09-17-2008, 04:45 PM   #19
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P.S. DO NOT use a turned down tip, it will be LOUDER!! BTDT!
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Old 09-17-2008, 05:09 PM   #20
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Quote:
Originally Posted by JasonC SBB View Post
You mean the 5x8 was quieter than 4x9, correct?

correct sir.
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