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Old 04-18-2012, 03:34 PM   #21
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Quote:
Originally Posted by skidude View Post
Brain, how is your muffler tucked up so nicely while all the NBs I've seen have a giant muffler dangling below the bumper? That has always bugged me about my exhaust.
because y8sfabbed.



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Old 04-18-2012, 04:18 PM   #22
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Quote:
Originally Posted by Braineack View Post
mine is completely liveable (no drone, no loudness unless on pedal); wife approved. IIRC savington measured his (same muffler) at 82dB.


----

I see no benefit to those cutouts but for MORE NOISE.

You want less noise, get bigger mufflers.
/thread

The cutouts would be for dyno days/track events, the other 99% of the time it would be nice and quiet.

My miata had the same magnaflow as most of you guys and it was so much quieter then these duals.
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Old 04-18-2012, 04:26 PM   #23
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Originally Posted by dc2696 View Post
The cutouts would be for dyno days/track events, the other 99% of the time it would be nice and quiet.
quite and exactly the same speed, spool, torque, hp, etc.
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Old 04-18-2012, 06:35 PM   #24
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I have a smaller, round magnaflow model.... 3". I keep ear plugs in the glove box for long drives.



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Old 04-19-2012, 08:59 AM   #25
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Mines..




Wind noise on the interstate with the top down is louder.
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Old 04-19-2012, 09:44 AM   #26
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Tested mine with some free dB meter app, soft top and windows are UP for the tests.

idling in traffic: 55dB
engine off, at stoplight: 49-50dB

cruise top up (40-60mph): 72-74dB
cruise in nuetral same speeds: 67-68dB

WOT: 77-80dB

stereo on: 85-90dB


at worst, the exhaust is adding 7dB to the road/wind noise in cruise. At WOT, most the noise is coming form my intake.
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Old 04-19-2012, 01:04 PM   #27
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Picked up a free app (Noise Meter) and tested this morning. Soft top and windows up, no stereo.

Exhaust is 2.5", no cat, straight through to a 14x9 Magnaflow.

Idle 53dB

5th gear cruise:
40mph 60dB
65mph 74dB
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Old 04-19-2012, 11:13 PM   #28
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Mine is retarded loud. Ive got one of the quietest exhausts and it doesnt help.

Ive got road noise from the 275s (upgrading to a better tire to reduce noise). Sound from all the gaps. Realigning all the fenders and doors made a difference, and realigning the windows to seal better, helped. Gonna do ttop seals to kill the last of it. And when I finally get around to putting the carpet in, Ive got sound deadener, closed cell foam and some jute im putting down.

I cant stand a loud car anymore.
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Old 04-20-2012, 10:26 AM   #29
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yeah my road noise is louder than anything else.
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Old 04-20-2012, 03:49 PM   #30
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Quote:
Originally Posted by Braineack View Post
yeah my road noise is louder than anything else.
same here. i have a big magna muffler with 3inch from the turbo. cruising 60-80 on the highway the car is really quiet.
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Old 04-21-2012, 01:34 PM   #31
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I have to wear earplugs because if I don't, and go WOT and QSV and WG open, I die.

In my old 3" setup, I still always wore earplugs.
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Old 04-21-2012, 10:26 PM   #32
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When you guys measure dB you MUST measure dBA.

The 'A' weighting mimics the ear's response. Without it you get plain sound energy, and the bass will waaaaaay overstate the numbers.

The quietest straight-through muffler in cruise is probably the Dynomax VT muffler due to its spring loaded flapper:





I did one better and cut the flapper out and installed it after the bigassest Magnaflow 3" muffler that fit. The effect on drone at light throttle was dramatic:

https://www.miataturbo.net/diy-turbo-discussion-14/my-3-custom-exhaust-spring-loaded-flapper-valve-62488/
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Old 04-21-2012, 11:11 PM   #33
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I really like the dynomax, but when I looked they didnt have one that I thought would work well for the fbody.
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Old 04-22-2012, 12:50 AM   #34
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2OTL for Opti. I also liked having the stock WS6 catback with dual cutouts before the Y. I currently have a HUGE Magnaflow on the Miata now.

I'm going to pick up a DBa meter next day I have off.
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Old 04-22-2012, 01:11 AM   #35
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I'm running a 3" catback my self.. giant magnaflow muffler like 24" or something along with a 3" resonator and a 3" cat... Quiet as stock or a tiny bit louder. I barely hear it over the turbo whistling.

If i was to do it again, i'd run a cutout right before the cat right after the sensor and leave the stock exhaust on.

Currently its painted black.

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Old 04-23-2012, 09:19 AM   #36
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Any words on the reliability of that flapper? I had heard rumors that it didn't last as long as one would like (forever, really). I like the idea, but I want my exhaust to be forever, like a diamond.
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Old 04-23-2012, 09:31 AM   #37
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Quote:
Originally Posted by JasonC SBB View Post
When you guys measure dB you MUST measure dBA.

I used a free app for my phone. I realize it's not even close to accurate, but I gave a few reference points to get the idea.

one more point of reference, my office measures 44 "dB"
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Old 04-24-2012, 05:18 PM   #38
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Quote:
Originally Posted by skidude View Post
Any words on the reliability of that flapper? I had heard rumors that it didn't last as long as one would like (forever, really). I like the idea, but I want my exhaust to be forever, like a diamond.
The DSM/EVO guys have been running them for a while, and they tend to get less than a year out of them before they start to clatter at idle. I guess the little fiberglass cushion on the end of the flapper wanders off over time. They are moving a LOT of air, and run their cars quite a bit harder than most of us do, though (EGTs, race gas, etc) so one might last forever in a 300whp Miata where it only lasts months in a 600whp EVO. They also run them in the muffler, where JasonC runs his after the last muffler, so it will run MUCH cooler like that.
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Old 04-27-2012, 05:44 PM   #39
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I now haz flapper backpressure data, suckaz!!

Difference between flapper normal, and flapper wired open, is < 0.2 psi!
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Old 04-27-2012, 05:46 PM   #40
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I assume that's at WOT? What is the total pressure?
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