resonator for 3'' exhaust - Miata Turbo Forum - Boost cars, acquire cats.

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Old 06-30-2010, 10:46 PM   #1
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Default resonator for 3'' exhaust

I'm having someone make up a left exit cat back (or downpipe back) exhaust. Now due to size constraints and not having the cross over area at the back of a car to put a nice resonator/muffler, these seem to be my options.

What have others done for muffling a left exit while making it fit next to the transmission?

http://www.summitracing.com/parts/MPE-14419/

http://www.summitracing.com/parts/MPE-11219/

I drive the car on the street and the local track has a 96db limit and the AutoX pad has a 92db limit. I think it's going to be too loud for AutoX...
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Old 06-30-2010, 10:47 PM   #2
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both of those together would make for a decent sound.
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Old 06-30-2010, 11:07 PM   #3
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damn. didn't feel like spending money on two. if I just got one, I would assume to go with the larger?
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Old 06-30-2010, 11:10 PM   #4
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one of those is a muffler?

can you afford two of these?

http://www.summitracing.com/search/B...c&autoview=SKU
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Old 06-30-2010, 11:15 PM   #5
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I can afford anything, I'm just a cheap ****** who dosen't like spending my hard earned cash.

I can get two of those for sure. And it seems like that will have no problem clearing. Would you run them one right after the other or space them out a bit?
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Old 06-30-2010, 11:15 PM   #6
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what's the difference between all 3 of those? Just length?
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Old 06-30-2010, 11:17 PM   #7
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you go with one it will be fairly loud.
2 just right.
anything more (or bigger sizes of either) will also reduce sound quite well
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Old 06-30-2010, 11:19 PM   #8
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Ansa silverline is all you need.
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Old 06-30-2010, 11:39 PM   #9
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Quote:
Originally Posted by 18psi View Post
you go with one it will be fairly loud.
2 just right.
anything more (or bigger sizes of either) will also reduce sound quite well
Ok, now what about a single 16'' long Borla XR1 straight through?

http://www.summitracing.com/parts/BOR-40944/?rtype=10

I think what i may do is build it with one, and then if it's too loud I'll jut have a second added.
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Old 06-30-2010, 11:45 PM   #10
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"loud" is relative. one mans loud is anothers silent. for me I wanted something really deep but barely louder than the stock muffler. I got very close to that with a 26x8 magnaflow like brainey and many others are using. surprisingly I didn't even need a resonator.

Here is a clip (though its hard to tell from the shitty quality)




with a single like the one you posted it will be SIGNIFICANTLY louder.
you decide
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Old 06-30-2010, 11:57 PM   #11
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Lets just put it this way. No way in hell I'm running something as big and heavy as Brain's. It's a track car and I'm JUST trying to get past sound restrictions. That and not raspy is all I care about. It can be loud, just not raspy loud.

I also drive an FD RX7 with a straight through exhaust to an HKS super dragger exhaust... so I'm used to LOUD! ... lol
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Old 06-30-2010, 11:59 PM   #12
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ya, so neither of those you posted I would consider "loud"... louder than average... yes but not undrivable obnoxious loud. I think I'll give the XR1 a go. And if it's too loud I'll add a dynomax.
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Old 07-01-2010, 01:16 AM   #13
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Oh mine was not loud by any means. So if that is "quiet" for you then don't even bother with any resonators.
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Old 07-01-2010, 01:50 AM   #14
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Can I convince you to just do a regular right exit? This setup sounds perfect to me and since we're the same age I think you'd like it too.

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Old 07-01-2010, 02:23 AM   #15
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I have a new one of these sitting in the box in my garage if you want to buy it:
http://www.summitracing.com/parts/MPE-14419/

I also have a new 6" dia x 18 magnaflow muffler that I've decided not to use.

In addition, I have my old (yet practically new) Enthuza 3" NB turbo speeder with about 500-1000Km on it. Though you don't have an NB.

I seem to have accumulated a bit of a collection.

I ended up going with a gigantic Y8S approved 5x11x22 custom made 3" Enthuza. Jason did an excellent job.
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Old 07-01-2010, 09:38 AM   #16
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i run a 2.5" turbo back with a high flow cat NO muffler and i dd it no problems its still quieter than the pos civics with thier rice cans!!

Kris.
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Old 07-01-2010, 09:54 AM   #17
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Quote:
Originally Posted by falcon View Post
No way in hell I'm running something as big and heavy as Brain's.
Those dynomax bullets that Y8s linked work great, are light and last. I've used them in both SM and IT Miata exhausts. Put that bullet where the cat would be and the run a down turn to the ground just after the driver's seat. That'll put the noise behind you and keep the exhaust very light.
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