Track day noise reduction suggestions?

Judder · 2 Oct 2017

So I fitted Dansk boxes to my 996 #1 as the original boxes where in a pretty sad state and the sound from them is great

I recently attended a 102dba track event and was told that I was very on the border of being too loud for the event

Anyone got any good suggestions as a suitable means to deaden the noise or can share what they do with theirs to help?

Many thanks in advance!

crash7 · 2 Oct 2017

Decibel devils are an option.

I had the same problem and had something similar to a decibel devil made up by http://www.pipewerx.com/.

They fit inside the tailpipes as oppose to bolting on, they dropped my static db level by 2 - 3 db

I have also installed an under drive pulley, this reduces engine noise which can contribute to a db reading given the engines position in a 911.

911munKy · 2 Oct 2017

Google 'DB killer' and see if you can get something that fits inside your tailpipes.

I have one for my RSVR1000 motorbike and it definitely makes the race pipe quieter.

Judder · 2 Oct 2017

Thanks for the options - much appreciated :thumb:

I've dropped Pipeworx an email to see what they can do and I'm trying to see what standard ones might fit, however as the 996 exhausts are quite curved I'm not sure if the bike style ones would easily fit :?:

crash7 · 2 Oct 2017

I went around and around on this, there is very little information out there.

I was prepared to change my rear silencers, however upon contacting all of the usual suspects, Dansk, Top Gear, Milltek etc nobody could give me db levels for there systems.

Haywood & Scott were the most helpful by some margin and were prepared to custom build a pair of boxes to a pre-defined db level, cost was circa £1k

As a last throw of the dice I sketched up what I wanted and mailed over to pipeworx, cost was circa £60 and to date they have been ok, no issues with static at Brands, Combe or Bedford, although drive by at Bedford was an issue, but the limit there is very low (87.5db)

Good luck!

Judder · 2 Oct 2017

Thanks again crash7 et all

I'm looking at using two of these as a temporary backup just in case I have troubles as I'm meant to be at Goodwood this Satuday

Off the top of anyone's head do you know what diameter the bore, and ideally length is of the 996 exhaust?

Thanks again

HSC911 · 3 Oct 2017

crash7 said:
no issues with static at Brands, Combe or Bedford, although drive by at Bedford was an issue, but the limit there is very low (87.5db

Let me know when you are next at Bedford, I am only 3 miles away.

Could have met there instead of at Heathrow!

:thumb:

Track day noise reduction suggestions?

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