Porsche 911 996/ 997 Gundo exhaust hack | Vlogs

My Porsche 911 996 has always sounded a bit tame. Sure, it's got a 3.4-litre naturally aspirated flat six but, the standard mufflers do a good job of muting the exhaust note. So I was planning on fitting an aftermarket back box, but then discovered there was a much cheaper way to achieve the same results. Known as the Gundo Hack, it consists of a welding a small bypass pipe between the inlet and outlet pipes of the standard mufflers. This allows some of the exhaust gasses to bypass the sound deadening muffler thereby changing the tone and volume of the car's exhaust note. The modification essentially mimics the official Porsche Sports Exhaust. However, there is no switchable valve so the exhaust is permanently in sports mode. In this video you can see the modification being carried out and, compare the sound of the car before and after the hack in a variety of conditions.
So turn up the volume and see just how wonderful my 911 now sounds.

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[ryzeus]

Honestly, that was pretty damn unexpectedly, impressive.

[hananas]

WOW that actually sounds much much more agressive!

[FezzaYT]

wow. what a surprising difference! Sounds so much better.

[Frocobo]

Lovely sound, Matt. Probably added 50 "psychological" hp at the wheels too ;)

[nickp]

I just bought a 996.2 in 2024, and the exhaust sounds amazing. I didn't know if it was original, as I've never owned a Porsche before. When I took it to the shop for an inspection, they told me it had a Gundo hack, and to look it up online. Here I am. It sounds freaking awesome. Every time I hit the gas while driving I get a huge smile on my face.

[guvernator]

Best exhaust difference video on Youtube for sure! Nice mod

[woobiewoo]

£200 you can't argue with that ! 👍

[DasHalbblut]

Love the mod and the video! Finally someone who gets how to make proper before/after-shots (various manoeuvres under the same conditions recorded from the same perspective). Congrats on your sweet-sounding car, Mat!

[T]

Sounds about 10 times better. Impressive stuff

[hannifandrade]

That change was extremly neccesary, well money spent

[BrendanG]

Gundo here - so glad to see my hack on your side of the pond! Enjoy

[justmedotcom]

I recently purchased a 2002 C2 and showed this video to my mechanics. They were skeptical about the mod and did the hack anyhow. It sounds amazing! They were blown away by it. They said they would be offering this to their customers going forward. Well worth the money.

[Mojo]

Wow, I'm so surprised by the improved tone. I'm studying at a university but as soon as I graduate I'm buying myself a 996 911(I'm trying to save as I go) as a graduation gift. I'm so going to have this done. I even know a metal fabricator, so thanks for the tip.

[sbomorse]

I can't believe such a small cheap mod could make such a massive difference to the sound! It sounds like a different car!

[senolcaluk]

holy moly what a difference in sound that is and such an easy and cheap fix. the neighbors must love you now 😂

[lawrencejob]

It didn't sound bad before, but I really like the end result. Nice work! Shame there's no room for a valve because I can see that getting annoying on long motorway trips.

[washingtonluis]

O yes now sounds like a proper sport car.

[billymcmonagle]

Paul is a genius and a nice guy, always handy to know guys like Paul, really knows his stuff

[jazzysaravana]

Brilliant Mod. Another proof of Cheap Thrills!

[devisbetrisey]

The difference is incredible!! It sounds so much better now!