Quieting down an aftermarket exhaust - ZX6R Forum
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post #1 of 10 Old 03-04-2017, 10:31 AM Thread Starter
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Lightbulb Quieting down an aftermarket exhaust

Local track has a 90db rule. As much as I want an Austin Racing or Racefit slip on, I know it won't pass.

I've considered closing the baffle further at the end to reduce db levels or wrapping the baffle with fiberglass.

Has anyone every modified or created a baffle to quiet down an aftermarket pipe?

Any input is appreciated. Thanks.

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post #2 of 10 Old 03-04-2017, 10:36 AM
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It takes a certain volume, to deaden enough sound.... the very short cannister size of most slip ons makes it near impossible to increase the attenuation they provide without restricting the airflow. You could try making a diffuser disc, like Supertrapp used to use......
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post #3 of 10 Old 03-04-2017, 11:35 AM
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Originally Posted by RJ2112 View Post
It takes a certain volume, to deaden enough sound.... the very short cannister size of most slip ons makes it near impossible to increase the attenuation they provide without restricting the airflow. You could try making a diffuser disc, like Supertrapp used to use......
^Yep, what he said.

You can't have a short simple can that's also quiet. The quiet ones are usually the big long ones that most people don't like cuz they don't look cool enough, because there's a lot more volume to reduce the noise. But you can't have both.

If I was you, since I know the track you're talking about is Laguna, I would probably just have 2 different cans. One big quiet ugly can for Laguna, and another one for everything else.

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post #4 of 10 Old 03-04-2017, 11:38 AM Thread Starter
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Originally Posted by sbk1198 View Post
^Yep, what he said.

You can't have a short simple can that's also quiet. The quiet ones are usually the big long ones that most people don't like cuz they don't look cool enough, because there's a lot more volume to reduce the noise. But you can't have both.

If I was you, since I know the track you're talking about is Laguna, I would probably just have 2 different cans. One big quiet ugly can for Laguna, and another one for everything else.
Yeah. That's probably the only way. I really like the weight loss and shock access of having the link pipe or getting a small aftermarket can but it's borderline not going to pass sound.

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post #5 of 10 Old 03-04-2017, 11:43 AM Thread Starter
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I might try getting a custom baffle. There's a guy around here that is always at track days and makes them

ROGUE RACING ZX-10R Jay Murray Decibel Killer Inserts


They direct sound away from the db meter and look like this



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post #6 of 10 Old 03-04-2017, 01:15 PM
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Ah yes, I think it was PG that mentioned the re-direction of sound tactic some people do at laguna. My understanding is there is one spot only where they measure sound which naturally is on the right side of the bike, so re-directing the exhaust should help reduce the reading by a few dB for sure.

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post #7 of 10 Old 03-04-2017, 01:59 PM
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Originally Posted by jd41 View Post
I might try getting a custom baffle. There's a guy around here that is always at track days and makes them

ROGUE RACING ZX-10R Jay Murray Decibel Killer Inserts


They direct sound away from the db meter and look like this



Believe his name is jay Murray I wa going to mention him too lol

Edit: should probably read the full post it included his name in it lol

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post #8 of 10 Old 03-04-2017, 03:15 PM
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Could always just short shift at the testing tower... I know that's what some do to get around it. I am in the same boat as you and just ended up running two different cans.
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post #9 of 10 Old 03-05-2017, 04:09 PM Thread Starter
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I've gotten some info from different manufacturers when it comes to expected db levels

Stock Exhaust at Idle 84 db, at 5000 rpm 88 db, 91 db @ 7000 rpm

- Arrow Gp2 Exhaust: 96dBa @ 7000rpm with the baffle fitted and reaches around 99dBa @ 7000rpm with the baffle removed.

- Austin Racing Exhaust: 103 to 120db

-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

- Scorpion power cone with db killer fitted 92 db @ 7000 rpm
Scorpion power cone with no db killer fitted 95.1 db @ 7000 rpm

- Scorpion RP-1 GP with db killer fitted measured 99.8 db @ 6750 rpm
Scorpion RP-1 GP with no db killer fitted measured 102 db @ 6750 rpm
*
- Serket taper with db killer fitted measured 92 db @ 6750 rpm
Serket taper with no db killer fitted measured 94.5 db @ 6750 rpm

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post #10 of 10 Old 03-09-2017, 09:46 PM Thread Starter
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I really like the Competition werkes gp exhaust bu it is crazy loud! 116db w/o baffle and around 106 with.


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