991.2 GT3RS with Dundon Street Headers and Lifetime Loud Muffler Sound Check

Who knew that in under three minutes your Porsche GT sound could go from crisp and exhilarating to not loud enough and needing more crackle. 

Our friend Leo was able to deliver this super awesome series of drive-bys & decelerations in his very own “Guards Red” 991.2 GT3RS with Dundon Street Headers &  GT3 Lifetime Center Muffler Installed.

In this video, you’ll find both stock and modded drive-bys to give you the ultimate comparison of sound and performance. 

If you’re in the market for upgrading your Porsche GT car, this is a great place to see and hear the visual and audible differences between your regular, run-of-the-mill exhaust system and Dundon Motorsports specially designed and engineered one. 



Most of us have experienced the many issues associated with both the stock Steel and Ti rear mufflers on our beloved 991.2 GT3. cracking, holes, not passing sound etc...  We've been reinforcing both the Steel and Ti versions for years after they crack and understand why they fail quite well.  We set out to fix the weakness of the OEM center muffler and include an option for those that want their car to pass the more and more prevalent dB restricted tracks without losing power.  We finalized the design and have tested at numerous tracks both for longevity and for dB reduction.

We're happy to announce our GT3 Lifetime Center Muffler.  It's available in 2 "flavors" Quiet and Loud.  The Quiet is for those customers looking for no drone* while cruising and to quiet the car at full boogie to attenuate some of the dB levels on the track or on the street.  The Loud is the muffler for those looking for no drone* at cruise, but a pronounced bark when getting on it!

We've tested the Quiet on a 991 GT3 with side muffler deletes that was 104dB before the muffler and passing a 90dB day after .  We've tested on a stock 991 GT3 and the car passed where it hadn't previously. And we tested on a 997.2 GT3 that had not passed at Laguna and passed a 90dB day.  We've recorded the Orange GT3 Center Muffler in our own testing at 10-12dB reduction over the OEM GT3 Muffler.  All of the testing was done on cars WITHOUT GPS Exhaust flap closing devices.


  • Lifetime Guaranteed including track use.
  • 321 Stainless Steel coupled with a high strength design.
  • Quiet has no power loss (up to 450whp engines), sounds great and reduces sound levels 10-12dB over stock.
  • Loud less restriction on higher powered cars (>450whp) and wicked flat six waiil!
  • 4" rolled exhaust tips in PVD Black are Standard.  Titanium Tips are optional!  Add our Nurburgring Quiet Tips to further quiet your car down!
  • Direct replacement of the OEM muffler, will fit existing modification if they work with the OEM Center Muffler.
  • OEM 63mm or 3" lower inlet sizing for increased flow.


* for no drone performance, the cars must maintain valves and use both the upper and lower exhaust paths in the muffler.