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      01-14-2012, 10:27 AM   #1
Schwaben
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How loud is your exhaust?

Starting this thread so people can get an actual idea of how loud different exhaust systems are instead of always asking, "what is louder".

I just ordered a simple decibel meter off Amazon for around 30 bucks.

In order to have some consistency between parties here are some guidelines;

1. Have vehicle outside and warmed up.

2. Hold db meter approximately ONE meter away from exhaust at waist level.

3. Slowly rev the motor to 5000 rpm, read meter.

This is fairly close to the procedure used at German tracks and by German TUV (2/3 of motor max rpm for the M3 is 5478 rpm but hey 5000 will do). Its obviously not the loudest you can get it but it will be a consistent measure. Plus I don't want to wrap my motor out without it being under load.

Post your results as follows:

E90 M3
Misterschaft GT2 axle back
Stock X pipe
db @ 5000 rpm: 112.1


Yes it gets louder, for example I got 118.6 at 7000 rpm in my garage but then thats cheating. I understand that there are still a lot of variables left out there such as temp and humidity and some may question the quality of different meters. I can say for sure that an Iphone or other smart phone "decibel meter" ap will not do it for you. I downloaded a free one for android and it was telling me 80db under the same conditions.

Hope to see more readings soon! I will update this as other members post to build a data base.
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      01-14-2012, 10:33 AM   #2
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Dont have reader either but my wife can hear me coming a mile away.

Gintani Catless Xpipe
Borla Race rear
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      01-14-2012, 06:05 PM   #3
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I have Active Autowerke with stock x-pipe. It is a decent amount louder than stock, it has more of the unique muscle V8/German exotic high pitch to it. My friend could hear me before she saw me when I was driving into her neighborhood today. I wouldn't say it was LOUD though.
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      01-14-2012, 06:18 PM   #4
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Quote:
Originally Posted by SehrSchnell View Post
I don't have a reader, but mine is load as f@ck!

Dinan-X-pipe (middle race exhaust - no cats)

and

Eisenmann Race

LMAOOO "loud as f@ck!" good enough for me!
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      01-14-2012, 07:04 PM   #5
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i'd like to get my hands on a decibel meter to test... anyone want to let me borrow one? haha

one of the louder exhaust set-ups i've ever heard out there though:

Mastermind RACE X-Pipe & Arqray Non-JASMA RACE Muffler
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      01-14-2012, 07:06 PM   #6
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This isn't a good test as a free rev is totally different than the exhaust under load.
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      01-14-2012, 07:10 PM   #7
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Quote:
Originally Posted by kitw View Post
This isn't a good test as a free rev is totally different than the exhaust under load.
i was actually thinking the same thing... when i free-rev it's definitely not as loud as under load
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      01-14-2012, 07:30 PM   #8
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Quote:
Originally Posted by E90///M3` View Post
i'd like to get my hands on a decibel meter to test... anyone want to let me borrow one? haha

one of the louder exhaust set-ups i've ever heard out there though:

Mastermind RACE X-Pipe & Arqray Non-JASMA RACE Muffler
haha you might have most others beat on this challenge jason
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      01-14-2012, 07:32 PM   #9
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Quote:
Originally Posted by kitw View Post
This isn't a good test as a free rev is totally different than the exhaust under load.
Quote:
Originally Posted by E90///M3` View Post
i was actually thinking the same thing... when i free-rev it's definitely not as loud as under load
but the test is not to see how loud your m3 is but in comparison which exhaust set ups are louder. So if all tested under the same situations, should give a good idea which setups are louder, no?
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      01-14-2012, 07:34 PM   #10
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huh? what did you say? I can't hear you ...
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      01-14-2012, 10:13 PM   #11
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Agreed the test is not perfect, but it gives enough controls to make a decent comparison between systems. You could always test under different conditions and post those results also. For example I drove around with the max metering on and the loudest "in cabin" level I got after about 15 minutes of doing some WOT runs was 105 db.

The 2/3 of rpm at a distance of one meter is just a set of controls. Its not perfect but it should give members a little bit of clarity on a subject that is rather speculative around here.

I would say to feel free to post other results under other conditions, we could even have a decibel contest so to say. loudest exhaust gets one of these --->, sorry I'm cheap....
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      01-14-2012, 10:14 PM   #12
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Quote:
Originally Posted by 1SICKM View Post
Dont have reader either but my wife can hear me coming a mile away.

Gintani Catless Xpipe
Borla Race rear
My wife says the same with the stock exhaust. Not quite that far though.
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      01-14-2012, 10:40 PM   #13
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i donno if the guy is on these forums, But their was an M3 owner in florida that had full straight pipe exhaust headers back. It was just as loud as the funny cars at the track lol.
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      01-15-2012, 01:27 AM   #14
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Quote:
Originally Posted by AMPowerJ View Post
huh? what did you say? I can't hear you ...
LMAO i just did that on a cold start this morning.
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      01-15-2012, 02:22 AM   #15
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Quote:
Originally Posted by SehrSchnell View Post
I don't have a reader, but mine is load as f@ck!

Dinan-X-pipe (middle race exhaust - no cats)

and

Eisenmann Race

"load"..

Drinking tonight are we...
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      01-15-2012, 02:24 AM   #16
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You can get a db reading for the iPhone for around a $1 for anyone interested in doing this.
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      01-15-2012, 02:53 AM   #17
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^^

Which specific app?
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      01-15-2012, 03:22 AM   #18
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Quote:
Originally Posted by StuttgartM3 View Post
Post your results as follows:

E90 M3
Misterschaft GT2 axle back
Stock X pipe
db @ 5000 rpm: 112.1


O man, if the axle back has 112, I don't to know what my Meisterschaft GT with catless x pipe would read in at. I've had it on for about 2 weeks and it is just stupid loud. Sounds like there is no exhaust at all.
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      01-15-2012, 04:24 AM   #19
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Quote:
Originally Posted by amg135i View Post
but the test is not to see how loud your m3 is but in comparison which exhaust set ups are louder. So if all tested under the same situations, should give a good idea which setups are louder, no?
Nah, it's totally different free rev vs load depending the design of the muffler. The delta on the Akrapovic is much more than the Innotech for example. My Eisenmann Sport + Turner Test Pipes was just as loud under load as the Akrapovic but almost 9db quieter on free rev.
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      01-15-2012, 11:54 AM   #20
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For what its worth I hit 121.4 db in 3rd at around 7500 in a tunnel going into Austria this morning
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      01-15-2012, 01:00 PM   #21
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Quote:
Originally Posted by SehrSchnell View Post
I'm always drinking.
LOL
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      01-16-2012, 03:20 PM   #22
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Quote:
Originally Posted by E90///M3` View Post
i'd like to get my hands on a decibel meter to test... anyone want to let me borrow one? haha

one of the louder exhaust set-ups i've ever heard out there though:

Mastermind RACE X-Pipe & Arqray Non-JASMA RACE Muffler
I've got one. I'm in SF.
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