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I have replaced a cat with a resonator before, and it made the car quieter.
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You got my attention. Was this on a Miata?
Which resonator? |
Lets agree that adding more things to the exhaust that are not straight pipe will make it quieter, mmkay?
If I added a cat to my exhaust (move resonator back, add cat where resonator now lives) it would get quieter. If I added another resonator downstream of the current resonator, it would get quieter. If I added a flapper thing to my exhaust, it would get quieter. If I added a resonated exhaust tip to my exhaust it (might) get quieter. Anything that isn't a straight pipe is going to make it quieter. The practical concern is how you are going to fit and support all this shit under the car ;) |
well we know there's room for a cat AND a resonator under there cause the msm has both. AND a huge muffler like the Maggie if you place it right. so really, it's about how good of a fabricator you are and how not terrible you are at measuring and fitting
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OP is getting an MKTurbo setup. Right now we are just trying to figure out how much to spend on adding resonators and what type. He is the first person to want to go even quieter then just the giant magnaflow muffler.
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Well, Shuiend has said, tentatively, he thinks he can fit 18" X 5" resonator like EO2K, and a second 12" X 4" resonator, plus the magnaflow, so maybe I should stop overthinking it and just go with that.
EO2K, was there a reason you went with the regular bottle vibrant over the "ultra quiet" one? |
Originally Posted by 18psi
(Post 1427670)
You got my attention. Was this on a Miata?
Which resonator? |
Originally Posted by Engi-ninja
(Post 1427684)
Well, Shuiend has said, tentatively, he thinks he can fit 18" X 5" resonator like EO2K, and a second 12" X 4" resonator, plus the magnaflow, so maybe I should stop overthinking it and just go with that.
The downside of the spring flapper I did is it will let out a rattle or 2 when taking off from a light. |
I used to have a video where I let the car idle and then I manually opened the flapper and let it close ... open... close. There was a substantial effect on the bass note.
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Ok, thanks! I think I will start with the 2 resonators, and if it's too loud, I'll add a flapper later.
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I can say, I am way to lazy to make a flapper valve. So you will be on your own for that if you want to go that route once you have the exhaust.
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Also, just for reference, I called Magnaflow and spoke to their sales engineer, and he said that the resonators do not utilize offset pressure waves to cancel sound, but rather just absorb vibrations using the packing. I think only chambered mufflers and Hemholtz resonators use destructive interference to reduce sound.
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Originally Posted by shuiend
(Post 1427679)
OP is getting an MKTurbo setup. Right now we are just trying to figure out how much to spend on adding resonators and what type. He is the first person to want to go even quieter then just the giant magnaflow muffler.
From 2005: https://forum.miata.net/vb/showpost.php?p=1429799&postcount=15 I think I had it installed it in 2002. This was my first attempt. I had it redone with an even bigger Magnaflow, which I then kept for many years until upgrading to bigger trubo and 3" exhaust... which needed the flapper to cut the bass. https://cimg2.ibsrv.net/gimg/www.mia...6f7e48f281.jpg https://cimg0.ibsrv.net/gimg/www.mia...981b830432.jpg No I was the first. I was also one of the first ones to use the giant-ass Magnaflow, before it became common. Back when I had a 2.5". It was quiet enough, with a resonator and high flow cat. When I went 3", it was too bassy, so I added the flapper. |
I can say, I am way to lazy to make a flapper valve. So you will be on your own for that if you want to go that route once you have the exhaust. |
Originally Posted by JasonC SBB
(Post 1427707)
No I was the first. I was also one of the first ones to use the giant-ass Magnaflow, before it became common. Back when I had a 2.5". It was quiet enough, with a resonator and high flow cat. When I went 3", it was too bassy, so I added the flapper.
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Originally Posted by 18psi
(Post 1427644)
You can add a huge resonator as well, I like the vibrant oval because it's about as much packing as you can get in a resonator.
Originally Posted by NBoost
(Post 1386909)
Can confirm that my Vibrant Ultra Quiet resonator/muffler is the same way (This one: Vibrant Performance ::. ). 2.5" O.D., internal is like 2" I.D.... I don't like it, but Vibrant and Borla are doing it. I don't have the entitlement to dispute Borla's design, but not everyone has that self-control. Both companies offer a good product though, I have been satisfied with both in a couple different applications.
Originally Posted by EO2K
(Post 1386928)
My Vibrant Large Body 3" x 18" Bottle Style Resonator PN 17950 was NOT built as you describe. It's full 3" all the way through the core :likecat:
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Originally Posted by Engi-ninja
(Post 1427705)
I think only chambered mufflers and Hemholtz resonators, or 1/4 wave resonator Tube/J-pipes use destructive interference to reduce sound at targeted frequencies.
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you guys forgot my super science test:
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Anybody ever heard of these? They have little louvers to capture more frequencies. Stupid expensive though.
https://solo-performance.com/qr-resonator-series |
why toss away 7%, when all you need is the bigmaflow anyway?
it's just a louvered muffler...you can buy the same on ebay for $15. https://solo-performance.com/images/...s/mr/1full.jpg for $130, vs: http://i.ebayimg.com/images/g/dd4AAO...ne/s-l1600.jpg for $35.99 |
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