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Discussion Starter #1
Right guys/girls, for comparison I'm interested to see what db the after market exhausts are putting out.

From what I've seen/read all I know is:

Two brothers - 94db at idle
Stage 2 silencer - 87 at idle

(correct me if I'm wrong)

But please post any figures you guys know and any experiences with the Exhaust you currently have :)
 

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Hi Benzz,

Yea, that was my result but I know results vary slightly even if we use the same slip on/full exhaust on the same gen bike but here is mine again

2 Brothers M2 Black Series C/F Slip on a 2013 ZX6R
-Idles at 95dBs
-5K RPM at 103dB


Here are some stats that can be found online although it doesn't tell you the exact dB level, it gives you a "+" for how much louder it is than stock. All the exhausts were tested on a 2012 ZX6R. Two sound levels will be given and that's at wide open throttle (WOT) and at 5K RPM cruise (cruise). Please note, the levels given are compared to your 2012 stock exhaust. Baffles/silencer results not given here to make things simpler and I will include the manufacturer selling price as of 2012 when the test was done. Link to source at the bottom *Loudest Slip-On and Full System will be bolded, quiestest will get italicized and the most expensive Slip-On and Full System will be marked with a red price. and the cheapest with a green price.

SLIP-ON CANISTERS

VANCE & HINES CS ONE BLACK STAINLESS SLIP-ON
DB at WOT: +9
DB at cruise: +5
Price: $499.95

YOSHIMURA R-77 CARBON/STAINLESS SLIP-ON
DB at WOT: +6
DB at cruise: +5
Price: $599

LeoVince GP Pro stainless slip-on
DB at WOT: +10
DB at cruise: +10
Price: $509

Hotbodies Racing MGP Growler Carbon/Stainless Slip-on
DB at WOT: +17
DB at cruise: +16
Price: $299.95

Akrapovic Titanium/Carbon Slip-on
DB at WOT: +4
DB at cruise: +3
Price: $744.95

FMF Apex Carbon/Titanium Slip-on
DB at WOT: +11
DB at cruise: +10
Price: $549.99

HMF Performance Series Stainless/Aluminum Slip-on
dB at WOT: +13
dB at cruise: +9
Price: From $359.99

Competition Werkes Carbon/ Stainless Slip-on
dB at WOT: +19
dB at cruise: +16
Price: From $349.99

Jardine RT5 Titanium/Carbon Slip-on
dB at WOT: +12
dB at cruise: +17
Price: $537

Hindle Evolution Stainless Slip-on
DB at WOT: +11
DB at cruise: +7
Price: $424.89

Two Brothers Racing V.A.L.E Black Series Carbon/Stainless Slip-on
DB at WOT: +19
DB at cruise: +17
Price: $649.98

M4 GP Mount Stainless Slip-on
DB at WOT: +19
DB at cruise: +17
Price: $342

Yoshimura R-77 EPA Legal Stainless/Carbon Slip-on
DB at WOT: +0
DB at cruise: +2
Price: $629

FULL SYSTEM EXHAUST

Leo Vince Factory R Stainless/Titanium Full System
DB at WOT: +16
DB at cruise: +15
Price: $1479

FMF Apex Titanium/Carbon Full System
dB at WOT: +15
dB at cruise: +13
Price: $1799.99

Brock’s Performance Alien Head Stainless Black Ceramic Coated Full System
DB at WOT: +19
DB at cruisE : +15
Price: $1395

Hindle Evolution Stainless/Carbon Full System
DB at WOT: +12
DB at cruise : +11
Price: $1199.99

Yoshimura R-77 Stainless/Carbon Full System
dB at WOT: +11
dB at cruisE : +9
Price: $1149

Two Brothers Racing Black Series V.A.L.E. Stainless/Carbon Full System
dB at WOT: +15
dB at cruise : +14
Price: $1189.98

Cliffs:
- Loudest Slip-On is a tie between Two Brothers M2 V.A.L.E Black/Silver series and the M4 GP.
- Quietest Slip-On is the Akrapovic Titanium/CF Slip-On.
- Most expensive Slip-On is the Akrapovic Titanium/CF Slip-On.
- The cheapest Slip-On is the Hotbodies Racing MGP Growler Carbon/Stainless Slip-on

- Loudest Full Exhaust System is Brock’s Performance Alien Head Stainless Black Ceramic Coated Full System
- The quietest Full Exhaust System is the Yoshimura R-77 Stainless/Carbon Full System
- Most expensive Full Exhaust System is the FMF Apex Titanium/Carbon Full System
- The cheapest Full Exhaust System is the Yoshimura R-77 Stainless/Carbon Full System

http://www.superstreetbike.com/features/slip-and-full-exhaust-system-shootout-2012
 

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What equipment and testing procedure are you using to measure decibels?
The long list taken above was done fairly scientifically by SSB and is in the link provided

On my own bike, it is not very scientific but not off by far I'm sure. I used my phone :devious not sure about anyone else
 

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This is so prone to error and variation when comparing online noise levels it isn't even worth asking. The test procedure, location the test was done in, equipment used and operator training/proficiency very so widely it's impossible to good comparative numbers off the internet. Even for professionals taking measurements, there are more than a few "accepted" test procedures.

Stock exhaust = most likely quietest
Aftermarket CARB/EPA stickered exhaust = louder than stock (slightly)
Aftermarket non-CARB/EPA stickered "street" exhaust = louder still
Aftermarket "race" or "off highway only" exhaust = loudest
 

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This is so prone to error and variation when comparing online noise levels it isn't even worth asking. The test procedure, location the test was done in, equipment used and operator training/proficiency very so widely it's impossible to good comparative numbers off the internet. Even for professionals taking measurements, there are more than a few "accepted" test procedures.

Stock exhaust = most likely quietest
Aftermarket CARB/EPA stickered exhaust = louder than stock (slightly)
Aftermarket non-CARB/EPA stickered "street" exhaust = louder still
Aftermarket "race" or "off highway only" exhaust = loudest
Yes, comparing dBs levels like this isn't scientific but gives those who are interested a decent comparison as to how loud it is vs the typical "louder than stock" comment.

Of course I provided the testing done by SSB where all bikes were tested under the same or very similar conditions in the exact same place using the exact same dyno. That is about as scientific as we are going to get as motorcycle riders.

Much like the threads posting Dyno results (which can't really be used to show whose bike has more HP or torque), insurance rates, costs for shops to repair bikes nor even OTD prices for new bikes, they don't paint a 100% accurate picture due to so many different variables but they do give us a bit of insight into what we are looking for and what they (numbers) should look like.
 

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Discussion Starter #9
thanks for the input guys, helped me compare a little bit more and decided to go for the Two Brothers black series with the P1X.

Will post up in a week or two when it arrives, import from the US :)
 

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As I said, that SSB info is utterly worthless. It was taken inside a dyno room with all the fans and dyno running. It has no relation to how loud a system will be in the real world. Nor can it be used to compare sound level numbers obtained anywhere else.
 

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As I said, that SSB info is utterly worthless. It was taken inside a dyno room with all the fans and dyno running. It has no relation to how loud a system will be in the real world. Nor can it be used to compare sound level numbers obtained anywhere else.
You must have ignored the part where they explained that was why they decided not to post actual decibel levels but instead the difference between the recorded stock decibel and aftermarket decibel level. What difference does it make now? Real world, the stock should be around 80. Let's say in that Dyno room, it comes to 90 or any arbitrary number you want. Now you change the exhausts and record the decibel levels and note the difference. Not sure why it is so hard to grasp. Everything in the Dyno room is basically the same and the only big change is the exhaust. All the different exhaust systems were tested in the same Dyno room under similar conditions. It at least gives us a very accurate picture of which slip on is louder and which ones are quieter; anyone who has owned a Two Brothers or an M4 will agree with te results that those two are two of the loudest around. But carry on
 
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I just installed a graves slip on two weeks ago aaaaaaand it's awesome haha

Stock Exhaust at Idle 84 db at 5000 rpm 88 db
Graves Slip-on at Idle with insert 90 db at 5000 rpm 103 db
Graves Slip-on without sound insert 96 db at 5000 rpm 106.5 db
 
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