Yogi911

Its porsche. Has to start with a P. Haha.

PVSSS

Richard.

great, every Porsche should have a sound trumpet ! So now how get the carpet out of the boxster behind the passenger seats ???

Richard.

So I can open up the membrane in the carpet at the end of the pipe for enhanced sound

JCtx

Hey, did it go back just like it was from the factory? That's my primary worry, since I've read that's typically not the case. Also, what exactly did you have to do/remove??? Thx. Don't want any signs (wrinkles, etc) carpet was removed, like it's supposedly the case; that's why I haven't done it yet. Could also do it on the engine side, removing the tube and plugging it (already have plugs for that). But that requires significant disassembly, and don't want to do it just for the stupid symposer. But yes, it's really annoying it comes from nothing to full boom at exactly 4K rpm. And it's so loud it even masks the exhaust with PSE ON. I personally hate intake noise, especially when it overpowers probably the best sounding engine ever created.

It is ENHANCED man. Look at the plunger-type cone near the valve. It's like a speaker, with a membrane inside to amplify sound, so basically a mechanical speaker.

It is my understanding only the CAYMAN GTS has the symposer, not the Boxster. Find out for sure before cannibalizing your car.

ChicagoSpeed996

Anybody have the parts numbers yet?

erik_plus8

No. For it to be "enhanced" or amplified some energy must be added, like a speaker. There is not. The membrane is just that - a separator of the intake air in the manifold and ambient air in the tube up to the cockpit. The separation is needed because of the low pressure in the intake manifold.

Sure, the membrane affects the sound character in some way, much like a piece of cloth in front of a speaker would. But once there, it's there, it's not an active part of the design.

Further upstream, there's the control valve which is open/closed depending on engine speed (and maybe load) and driving mode (NORMAL/SPORT/SPORT PLUS)

erik_plus8

I found and downloaded PET catalogues (for 981S and GT4) somewhere on the interweb (sorry, don't remember where), did you try?

I am very curious what you're going to do with the part no:s. Please tell.

JCtx

The membrane is to seal the intake indeed, but the cavity to amplify the noise. How do you think a guitar works? Otherwise it'd be just a straight tube. I believe the Porsche literature even spelled that out. But yes, it's more acceptable than a freaking speaker, but equally annoying to me.

Richard.

Boxster GTS has it too http://www.roadandtrack.com/new-cars...d-test-review/

erik_plus8

Well, yes, I can agree in principle. But - downstream of the membrane the diameter of the hose is back to what is was upstream and in my view, any amplification occured in the "membrane can" will be cancelled out before it reaches the cockpit. But I have very little acoustic experience and I might be totally wrong in my practical approach

And in any case - as you know - I totally agree with you that whatever enters the cockpit that way is massively annoying - hence my plug

Richard.

here is more detail

ChicagoSpeed996

Looks like the part numbers that are needed are 981 110 028 00 and 991 110 282 03

i cannot not tell if these will connect up to the intake or not. I don't see any other different part numbers except the right snorkel where the last number changes on the PET but not according to sunset's PET. 981 110 212 02 (Sunset PET for GTS) and 981 110 212 03 (for the PET above)

erik_plus8

It seems you're planning on after-installing a symposer in your car? Did you test drive a GTS and decided that this is the sound character you want?

If so - just a friendly reminder - the symposer is controlled by a vacuum actuator + electronically controlled valve (which is controlled by the ECU). An S will most likely not have either the SW nor the connections or vacuum hoses in place needed for the system. Even if you plan on having the system sitting "passively", I would guess the vacuum actuator is closed default (spring loaded). Hence you would have to force it always open.

extanker

IN THE 60'S flipping the air cleaner lid over made noise too.....but it got old real quick....kinda like base ball card or balloons in your bikes spokes ......sound sym...poser ...good grief .Ironic it seems a lack of oxygen thought this idea/option up

Voyager6

Richard 'borrowed' a photo of my post on P-9

http://www.planet-9.com/981-cayman-a...ml#post1853361

There are two issues: I believe one end of the symposer connects to the air cleaner as there is a different right side air cleaner for the I155 symposer option. This may require removal of the engine to remove/replace (from factory service manual). Option 2 is to modify the existing one in place. You'd need to drill a hole in the cleaner at the proper spot and put a mating flange/coupler in the hole. Hopefully there is room to do this.

The second issue is the vacuum valve connects to the PSE vacuum switch (aka electronic change over valve). If you have PSE, then it is just a T and some vacuum line. If you don't then either you can hard wire it, but I am not sure if on is with vacuum or not.

Right air cleaner part is : 981-110-214-01

The three parts are not that expensive, under $300 for the bunch.

V6