Does the 992.2 GT3 really need an aftermarket exhaust? Our dyno day says “Yeah”

Does the 992.2 GT3 Really Need an Aftermarket Exhaust? Our dyno day says “Yeah.”

Every time Porsche drops a new GT car, the same question hits our inbox:

“Does it really need an exhaust, or did Porsche already nail it?”

With the 992.2 GT3, that question got louder than the car itself. More filters, more emissions gear, more complexity… and a lot of owners wondering if there’s still real power left on the table, or if a Porsche 992 GT3 aftermarket exhaust is just about sound and flex.

So when a customer rolled in with a brand-new Gentian Blue 992.2 GT3, totally stock and grinning ear to ear, we knew exactly what we wanted to do: Perfect excuse for a proper dyno day.

To answer the question we love to hear:

“If I do a Porsche 992.2 exhaust upgrade with you guys, is it actually going to do something? Or is it just sound?”

We weren’t going to answer that with a brochure. We were going to answer it with data.

 

Watch the full video on YouTube.


Step One: Stock 992.2 on the Dyno

992.2 on Dyno


We put car to our in-house dyno and did what we always do first: get a clean, honest baseline.

If you’re new to this stuff, a dyno is basically a treadmill for cars. It lets us measure power at the wheels and compare runs back-to-back under the same conditions. There are different types of dynos and a lot of ways to set them up—that’s a whole topic for another video and article—but the key thing here is this:

Same car, same dyno, same conditions. Stock 992.2 vs 992.2 with Dundon Exhaust. No guessing.

The 992.2 GT3 is a little different under the skin compared to the 992.1. It’s got extra particulate filters (more OPFs than the .1) and some gearing changes. That stuff shows up when you look at the curves. You can feel the car working a bit harder to breathe.

That’s where the exhaust comes in.

The Upgrade: Dundon Complete Exhaust on the 992.2


992 GT3 On Dyno with Dundon Street Headers

After we did the stock pulls, we installed our Dundon Motorsports complete system for the 992 GT3 – our Street Header/Complete Porsche 992.2 Exhaust package with the Lifetime muffler.

Call it whatever you want:

  • Porsche 992 2026 exhaust upgrade

  • Porsche 992 GT3 aftermarket exhaust

  • Or “that Dundon Motorsports exhaust thing that finally lets the car breathe”

Point is, it’s the same setup we’ve been refining for years on these cars.

Then we rolled the 992.2 right back onto the dyno and ran it again, same conditions.

What the Dyno Told Us

992.2 with Dundon Exhaust Dyno

Solid Purple - 992.2 GT3 with full Dundon Streer Headers

Dotted Blue is the 992.2 GT3 6MT 

We expected significant gains. We’ve done this song and dance with the 992.1.

The graph showed:

  • More power across the rev range, not just a cute little bump at peak

  • Stronger midrange where you actually live on track and on the street

  • Better pull all the way to redline

The Dyno confirmed a well designed exhaust makes power, sounds great and keeps the car happy with no check engine lights.

With the Dundon system on It revved cleaner, responded faster, and yeah, it sounded like a GT3 is supposed to sound. Angry when you ask it to be, civil when you’re just cruising.

So… Does the 992.2 GT3 Need an aftermarket Exhaust?

“Need” is a strong word. The stock car is great. Porsche doesn’t build bad GT cars.

But if you’re the kind of driver who:

  • Cares about how the car feels from 4,000 rpm to redline

  • Actually uses the car, not just parks it

  • Wants power you can see on a graph and hear every time you lean into it

Then a quality Porsche 992.2 exhaust upgrade isn’t just a vanity move. It’s a real performance mod.

Who This Is For

If you’ve got a 992.2 GT3 and you’re on the fence, this dyno day was basically built for you. Real car, real owner, real back-to-back test. No fantasy numbers, no magic conditions.

You love your car stock? Good.
You think there might be more in it? You’re right.

That’s where a dialed Porsche 992 GT3 aftermarket exhaust like our Dundon setup comes in. It’s the kind of Porsche 992 2026 exhaust upgrade that still feels OEM-plus, just turned up to where it should’ve been from the start.

If you want to dig into the graphs, hear the difference, and see that Gentian Blue car working on the rollers, check out the video on our YouTube. And if you’re ready to talk about waking up your own 992.2, you know where to find us.