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Old 28 May 2011, 09:55 PM
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Saalro
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Default Exhaust sound levels on track.

I went on a track day and the static sound level at 4500 RPM for a car with a redline of 7000 RPM was 101 DB, my car read 89 DB and that was with a standard exhaust system with a H&S back box.

I was planning on getting a full decat and remap but surely that is going to be over 101 DB?

The drive by limit is even lower at 87.5 DB at 20 meters.

What exhaust system are you running and what's the DB?

Thanks

Last edited by Saalro; 24 October 2017 at 09:15 PM.
Old 28 May 2011, 10:03 PM
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jura11
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Revolution or Miltek will be OK,Cobra Track day exhaust is next option,which is Track day friendly.


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Old 28 May 2011, 10:10 PM
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Stevesbluewrx
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Something I am looking at myself.


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Old 28 May 2011, 10:27 PM
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scouser321
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I didn't know they had to be at a certain noise level for track days.

What is the reason for this?
Old 28 May 2011, 10:40 PM
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GezP
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I've got a full decated Afterburner Vortex system and I think I'm on the limit if not over.

Out of interest guys, whats the best way of finding out an accurate DB reading?
Old 28 May 2011, 10:46 PM
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Saalro
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Does a classic have 1 cat or 2?

Thanks

Last edited by Saalro; 24 October 2017 at 09:16 PM.
Old 29 May 2011, 06:59 AM
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dynamix
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Originally Posted by scouser321
I didn't know they had to be at a certain noise level for track days.

What is the reason for this?
Neighbours of the circuits complain about the noise otherwise.

My Miltek at 5500 rpm is 90db on the static test. I very much doubt my car would pass a drive by noise test though due to the induction noise

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Old 29 May 2011, 07:08 AM
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Danny_P
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The Mongoose system on my car consistently reads 89db static at 5500rpm and 84db drive by. Be aware that no matter how careful you are these figures WILL differ from circuit to circuit dependent upon equipment used for testing, individual doing testing, surrounding features, weather conditions, position of jupiters moon's, etc., etc.

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Old 29 May 2011, 07:50 AM
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i have the rcm system on mine.it was 95db at 4500rpm last weekend at the scooby shootout.
Old 29 May 2011, 08:31 AM
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MalcB
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Full decat with resonator and Prodrive back box. Metered @ 92 db at Japfest. Sorry, that was the static test

Last edited by MalcB; 29 May 2011 at 08:34 AM.
Old 29 May 2011, 12:22 PM
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Saalro
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Would new headers and up pipe make it louder?

Thanks

Last edited by Saalro; 24 October 2017 at 09:16 PM.
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