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      07-24-2020, 10:11 PM   #1
ats*ben
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90db Exhaust List

I've been trying to find more information on what exhaust setups are able to pass the 90db sound limits at Laguna Seca. I figured a single thread would help in people listing their exhaust setups and/or if any lifting is required to pass. I would also love to see if anyone just has test pipes and is able to pass.

Post up your exhaust setup and if you need to lift or have "Laguna" pipes to pass!

X-Pipe:
Rear Section:

Pass at 90db:

Stock X-Pipe + Supersprint Race F1 Rear Section = Bimmer Barney

Stock X-pipe + Akra Evo Titanium Rear Section = Bimmer Barney

Stock X-pipe + M Performance exhaust - kyippee

Stock x-pipe w/ Primary Cat Delete + Dinan Rear Section - nickauger **92db**

AFE Resonated X-pipe w/ 300 cel cats + OEM Rear Section = roastbeef

Challenge Sport (cats+resonators) + Stock Rear Section - fsmtnbiker

RPI Catless X-pipe + Stock Rear Section - P1zzaboy **Pass at 92db**

Supercharger w/ Akrapovic Evolution X-Pipe + Stock Rear Section - dogbone **Pass at 93db full throttle, 90db with lift**

Akrapovic Evolution X-pipe + Akrapovic Evolution Rear Section - fsmtnbiker

Fail:

Stock x-pipe + Bimmerworld street exhaust (~94 dB in 2018) - kyippee

Evolve HFC resonated x-pipe + Bomiz valvetronic muffler in quiet mode ~93.4 dB vs 104 db in loud mode - kyippee

Last edited by ats*ben; 07-29-2020 at 04:41 PM.. Reason: Updated List
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      07-24-2020, 10:30 PM   #2
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The following are at full throttle, ideal gear (at top of 3rd gear for me) going up-hill, staying to the far right of track while passing the sound station. Beware that in 2020, they seem to have moved the microphone closer to the track. What used to pass in 2019 may not pass anymore.

Pass
Stock x-pipe + M Performance exhaust = pass (in 2018, I bet it still passes)

Fail
Stock x-pipe + Bimmerworld street exhaust = fail (~94 dB in 2018)

Evolve HFC resonated x-pipe + Bomiz valvetronic muffler in quiet mode = fail (~93.4 dB in 2020)

Evolve HFC resonated x-pipe + Bomiz valvetronic muffler in loud mode = fail (~104 DB in 2020)

Last edited by kyippee; 07-24-2020 at 10:48 PM..
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      07-25-2020, 12:03 AM   #3
dogbone
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Supercharged.

X-Pipe: Akrapovic Evolution
Rear Section: Stock.

93db at full throttle. Can pass sound if I lift just a bit.
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      07-25-2020, 03:24 AM   #4
kyrix1st
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90dB is ridiculous. Don’t some cars have louder exhaust from the factory?
Should sue them if the engine blows due to primary cats collapsing...
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      07-25-2020, 08:01 PM   #5
nickauger
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pass 92 db with test pipe, oem xpipe with secondary cat, dinan rear section
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      07-26-2020, 01:17 PM   #6
fsmtnbiker
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Pass:

X-pipe: Challenge Sport (cats+resonators)
Muffler: Stock

X-pipe: Akrapovic Evolution
Muffler: Akrapovic Evolution

On both setups, I also have had the MS Intake. Never had issues on a 90db day, no short shifting, no swerve between 5-6.
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      07-26-2020, 08:08 PM   #7
roastbeef
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pass: afe 300 cel cats, resonated xpipe, oem rear section.
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      07-26-2020, 10:36 PM   #8
Bimmer Barney
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Pass:
Supersprint Race F1 rear section, otherwise stock.
Akra Evo Titanium rear section, otherwise stock.

No goofy Laguna pipes and I don't lift.
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      07-27-2020, 05:02 PM   #9
ats*ben
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Updated. Thanks for all the feedback everyone. Keep it coming!
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      07-28-2020, 08:28 PM   #10
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Passed 92dB:

RPI catless xpipe
Stock backbox
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