Exhaust Valve Mod Kit

At high revs/full throttle, the sound is identical as, with or without this kit, the valve is open. The biggest difference is at idle and slower speeds around town - the car is throatier and there are more pops and bangs (even when in non-sport mode). However, on a trailing/closed throttle, the car remains very quiet.

Some cars use a vacuum pipe to control exhaust valves, the 992 controls them electronically - this mod ensures that the valve can stay open without causing errors on the dashboard. The 992 controls the exhaust sound at different rev levels, engine loads and modes by opening and closing a flap in the exhaust.

The configuration, flap setup and wiring is identical between PSE and non-PSE exhausts so you will also see a change in the sound of the vehicle with this modification.

The kit intercepts messages sent from the computer to the exhaust flaps; when you remove the kit, the car is totally reverted back to standard.

I've shamelessly focused a lot more on Apple devices than Android but i'm pleased to say that you can also control the kit with any device that has access to a modern web browser (Microsoft Edge, Google Chrome or Opera) and Bluetooth. Visit the link below and install this page as an app (PWA) for offline access. The page will allow you to connect to the device and control the valves.

992noise.com/control

Yes - the main challenge is locating the existing connectors to unplug which are under the rear bumper, just near the exhaust tailpipes. Once located, it is a one-handed job to unplug them. Check out the video for how to remove the connectors.

Click here to download detailed installation instructions (PDF format)

This 'version 2' of the kit, developed in the second half of 2024 and into 2025 consumed most of my weekends and I spent a lot of money buying electronic devices to decode the messages, components to use in the kit and of course on the design and manufacturing of the kit. Add in raw material costs and some moderate profit on top and I believe the kit still comes in significantly lower than some other devices, certainly a new sports exhaust!

More than one person said the version 1 was too cheap! I appreciated the feedback but it's just a box which overrides the built-in exhaust flap. Why should it cost any more? I'm covering the raw material costs, plus what I spent on R&D, and then i've added in some profit which I think is reasonable. The last thing I want is unhappy customers and I think i'd be unhappy paying any more for this ...

As with many products, they aren't rocket science. You just need some time, patience, money and a few tools which might cost you a lot more than one kit. I won't share what i've invested already but i'm telling myself that the tools will be useful for other stuff ;-)

Just a 992 owner a bit grumpy that his 'sports' exhaust was only sporty occasionally and who didn't want to modify his ECU or spend thousands on a new exhaust.

It's possible it won't work for your car. In this case, i'll refund you. This isn't my day job, so there's no reason for me to try and fleece you out of a few quid! I'll ask for the kit to be sent back at your cost, and i'll refund you for what you paid originally. You'll be out of pocket only for the shipping. If the kit is working but you're not happy with the sound, I can't refund you, sorry.

Version 1 kits were hand-made to order and were built and delivered within 10 days. Version 2 kits (this one) are manufactured by professionals and I assemble. They are far more complex but the turnaround time should be the same. Once I have a few orders under my belt i'd like to have some stock 'on the shelf' which can be shipped faster.

Check with me first if you aren't in the US, Europe or India. Shipping to the US seems to work well even though there seems to be a customs hold (missing docs) for a day no matter what docs I include! India is the most painful so far - shipping is nearly 2x the cost to the US and there may be an additional clearance fee to pay locally. UK and Europe no problems.

I'm really keen to create versions of this kit for the non-turbo 992's and also for the 992.2 new cars, however I don't have the luxury of having access to a test vehicle so progress will be slower. If you have one of these cars in the UK and would be able to leave it with me for a weekend I could make some great progress. Just drop me an email and we'll arrange a time.

Click here to download detailed installation instructions (PDF format)

If you bought your device before 1st June 2025, you can return it for a full refund within 60 days, no questions asked. You just cover the return shipping.

No matter when you bought it, if your device develops a fault within 12 months, i’ll cover repair or replacement costs and also reimburse your return shipping. You must ship back to me, and you must pay this cost. Upon receipt of a returned device, I may choose to refund the purchase price and not repair.

This warranty covers normal use and does not include damage caused by misuse, accidents, modifications, or unauthorised repairs.