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Old 03-21-2005, 01:37 AM   #76
DonkeyPunch
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Quote:
Originally Posted by Unabomber
Not to fear....Stromung testing will occur this Sunday. Plus, I will be in Socal (San Diego) in March going to a school for 4 months. Hopefully I can test a bunch of people up in LA during my "Unabomber invades Socal tour".

Ron what school you going to?

Is it at Fleet ASW?

Later,

Andy
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Old 03-27-2005, 09:04 PM   #77
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Bump for more updates thanks to some folks in Phoenix, AZ!
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Old 04-02-2005, 01:31 AM   #78
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have you tested any straight pipes (no muffler)?
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Old 04-02-2005, 06:04 PM   #79
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I tested at cut out. Since it was under the car and I couldnt test it as perfectly as the other exhausts, I slightly doubt it's reading. I got 112dB, which equals the loudest exhausts I have tested by Blitz.
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Old 04-05-2005, 03:36 AM   #80
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Hey - let me know when you are in town again. I now have a Scoobysport + TXS stealthback + uppipe to add to the list. Not many people have the Scoobysport it seems like, and I am interested to see how it compares to my old Prodrive.

john
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Old 04-05-2005, 10:53 AM   #81
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Quote:
Originally Posted by SaabTuner
Gets coated with carbon. My friends and I regularly wash our mufflers inside. I know I know ... corrosion. But what's the point in even having it if it doesn't muffle?
How would one go about this? Are you just wiping down the perforated tubing?

Tom
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Old 04-08-2005, 06:07 PM   #82
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I tested 5 more cars yesterday. I also tested the Worx Tuning exhaust, which is brand new. It is officially the 3rd loudest exhaust I've tested so far.
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Old 04-10-2005, 05:43 PM   #83
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Appreciate the time you put into your contributions, all very interesting. If you're ever in town you may borrow my car for testing.
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Old 04-11-2005, 01:33 AM   #84
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Unabomber:

Thank you for all the work you put into this. It will be very helpful to many members.

One detail:

I downloaded the .txt file of your data. In your notes, d) states: "3dB is equal to twice the loudness..."

Actually, 3db is a barely noticeable increase in volume. Where you may have gotten confused is that with audio equipment, +3 db represents a doubling of amplifier _power_.

Anyway, thanks again!
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Old 04-16-2005, 06:52 PM   #85
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No db test on the Greddy SP2 yet?
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Old 04-16-2005, 07:43 PM   #86
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washing the inside of your muffler? details?
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Old 05-06-2005, 05:17 PM   #87
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Bump for some more updates!
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Old 05-06-2005, 05:27 PM   #88
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Thats a nice test and all, but its not accurate to CA standards... and the calibration might be off on your meter when compared to official state testing equipment.

CA standards test it at 4500rpm, for reference. With a 95 dB limit +/- 1.5 dB for error. With my Radioshack analog meter, I tested 92 dB on my set-up, where the official reading by the State Referee is 95.1 dB. Thats quite a difference... but not to the human ear. 5 dB's isnt even really detectable by ear...
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Old 05-06-2005, 07:32 PM   #89
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It is not supposed to be a CA standard database. It clearly states at the bottom it is for comparison purposes only. Its purpose is to give people an idea how loud one system is relative to another, not what would keep you from getting a ticket.

The database is very valid because it is done with the same equipment and the same standards every time.

Unabomber, don't forget to look us up when you are here this summer. WRX03 claims to have the quietest stage II anywhere, we want to prove it.
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Old 05-06-2005, 07:54 PM   #90
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Quote:
Originally Posted by badboiWRX
Thats a nice test and all, but its not accurate to CA standards... and the calibration might be off on your meter when compared to official state testing equipment.

CA standards test it at 4500rpm, for reference. With a 95 dB limit +/- 1.5 dB for error. With my Radioshack analog meter, I tested 92 dB on my set-up, where the official reading by the State Referee is 95.1 dB. Thats quite a difference... but not to the human ear. 5 dB's isnt even really detectable by ear...
Actually, 5 db is _definitely_ noticeable.

Some people are able to notice a 1 db difference in volume, 3 db is considered a 'moderate' increase, 10 db is perceived as a doubling of volume.

I think it's great that Unabomber is doing this testing -- it is the kind of thing NASIOC could use more of.

I am only trying to make his work even more useful by explaining how spl given as a 'db' reading relates to how people actually perceive (or hear) sound.
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Old 06-21-2005, 08:53 PM   #91
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Bump for 2 more updates, another Borla Hush and another M2. Another local guy JUST got a Greddy SP2, so I'll be testing that in short order. I rode in his car and I have a fear that it might beat out my Prodrive as the Quiet King.

Quote:
Originally Posted by dbrier
Unabomber, don't forget to look us up when you are here this summer. WRX03 claims to have the quietest stage II anywhere, we want to prove it.
DO NOT worry. I'll be in Indiana somewhere around the 10th to the 12th of July. Once it gets a little closer, I'll start a thread in the MWIC forum about an improptu meet based on what's convenient for everyone. Aside from meeting my fellow Hoosiers, I'll be exhaust testing like crazy.
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Old 07-01-2005, 01:06 PM   #92
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1db is about the threshold of human perception on a solid test tone. With things like music or more complex sounds it is harder to hear small differences.

One click on a volume knob (if yours clicks) is about 1 to 2 db. 3db is twice the energy, but definitely not heard by a human as "twice as loud". 3db is what you get when you swap out a 300 watt amp for a 600 watt amp. This is why you can point and laugh at people who say their stereo is twice as loud afte getting an amp that is twice as big. It's a log scale.

As for what is heard as twice as loud, you could argue that for decades. It is subjective. 6db? 10db? I dunno. Personally I subscribe to the "about 10db" theory, but even that isn't perfect. 100db might be "twice as loud" as 90db to a person, but 110db may not be "twice as loud" as 100db to the same person. It's a crapshoot. And that is comparing the exact same tone. Two exhausts with simlar objective or measured loudness (db) may seem to a person to have a more drastic difference in subjective loudness .
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Old 07-02-2005, 09:52 PM   #93
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Tested a Greddy SP2 today.
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Old 07-05-2005, 11:30 PM   #94
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Quote:
Originally Posted by Unabomber
Bump for 2 more updates, another Borla Hush and another M2. Another local guy JUST got a Greddy SP2, so I'll be testing that in short order. I rode in his car and I have a fear that it might beat out my Prodrive as the Quiet King.



DO NOT worry. I'll be in Indiana somewhere around the 10th to the 12th of July. Once it gets a little closer, I'll start a thread in the MWIC forum about an improptu meet based on what's convenient for everyone. Aside from meeting my fellow Hoosiers, I'll be exhaust testing like crazy.
Hope to have lots of cars for you to test, I promise my car has a setup like no other. Place and time are set, see you thread in the Mid West or the Indy July thread.
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Old 07-06-2005, 01:36 AM   #95
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I see a lot of Blitz NUR Spec R exhausts out there... but no NUR Spec Touring, like mine. If you're ever up in the Bay Area, CA, Unabomber and want to add another data line to your charts, lemme know.

Gruppe-S SS headers (Jethot 2000 coated), Vishnu 321 Flex uppipe, Perrin downpipe, Blitz NUR Spec Touring catback. Although 'catback' on my car is something of a misnomer, as there are is no 'cat' to be in 'back' of.


-Bis

Last edited by Bismarck; 07-09-2005 at 11:02 AM.
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Old 07-09-2005, 03:47 AM   #96
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ok need specs on stealthback and prodrive axle back db
thanx
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Old 07-10-2005, 10:21 PM   #97
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I would like to see tests for the Veilside Titanium Tear Drop on a 2004-05 STi, or WRX.

Last edited by rs2.5-3.0; 08-30-2005 at 12:05 PM.
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Old 07-10-2005, 11:17 PM   #98
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A video of the Veilside Teardrop too!!

Those mufflers have monster internal diameters.. i'd love to hear what they sound like. Oh, if I ever had the $$...
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Old 07-26-2005, 10:08 PM   #99
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You should have the top 5
"Best Sound" / "The Most Quiet Exhaust" / "The Loudest"
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Old 07-26-2005, 10:19 PM   #100
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Quote:
Originally Posted by ix8vii
You should have the top 5
"Best Sound" / "The Most Quiet Exhaust" / "The Loudest"

Quote:
Originally Posted by unabomber
Which exhaust has the best sound? This subject is up to the individual. It is highly subjective and can lead to trouble with local noise abatement ordinances. That great sounding exhaust may be the cause of some expensive and/or time consuming noise abatement tickets. Arguably, the three most famous/popular "best" sounding exhausts are the ScoobySport, Stromung, and Prodrive. A smart move is to find someone in your local area with the exhaust component(s) you are interested in to hear it in person. Seek out locals via the NASIOC Chapters or NASIOC Regional Areas.

Which exhaust is the quietest? This question can be answered by listing hard data:

a. M2 Performance 94dB @ idle
b. GReddy Evolution 94dB @ idle
c. MRT Twin Tip: 96dB @ idle
d. Prodrive: 91dB @ idle
e. STi Muffler: 93dB @ idle

By using hard data, you remove human judgement and don't get stuck with a recommend "quiet exhaust" that in your opinion is now a loud and expensive nuisance. Keep in mind that these quiet exhausts only protect you from the chance encounter in areas with strict noise abatement laws. At wide open throttle (WOT) any aftermarket exhaust is considerably louder than OEM and even the quiet ones will not protect you from folly.

Additional full dB testing data can be found on this link.

Which exhaust is the loudest? "Commonly known" loud exhausts are the TurboXS RFL, Worx Tuning, Helix, Blitz NUR Spec R, Kakimoto, and BPM Twister MKIII.

Additional full dB testing data can be found on this link.
http://forums.nasioc.com/forums/show...hreadid=447182

Unabombers exhaust manifesto.
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