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Dundon Street (Catted) tuned length headers and valved side delete exhaust system for the 991 GT3RS and 911R are available now!   * Muffler shown is not included with the system, only to see how the system goes together! 


We were able to keep all of the things that people love about our race headers:

  • less weight
  • more power,
  • great sound,
  • quiet when you want it to be
  • no drone
  • lifetime structural warranty
  • 100% 30day money back guarantee
    • if you try it and don't like it, send it back we'll give you your money back!
  • Convertible to no cats with the swappable test pipes for track days (available separately).

We use 321SS (a superior grade of Stainless steel to the cheaper 304SS) and use an advanced  metal core catalyst with better mixing and less pressure drop than a typical 200CPSI catalytic converter.  All our products are mfg in the USA in our shop in Gig Harbor, WA.


By routing the primaries up and positioning the catalytic converter more vertical we were able to retain 99% of the primary length of the race system. This is how we are able to achieve 20whp max gains on the 991.2 GT3RS,   This is the most power from a catted 991.2 GT3RS  Exhaust system.


You get great drone free sound with working valves, 321 SS construction, industry leading power, lifetime structural warranty, and 100% money back guarantee, if you try it and don't like it, send it back we'll give you your money back!

Some pics installed on the car, the street headers are only about 0.5" shorter than our race headers. To fit everything we had to go up into the wheel well where the side mufflers sit. Only way to get the length required for real power gains...


Anything that can bolt up to the stock location is leaving power on the table...

Dundon 991 GT3/RS Street 

Dundon 991 GT3/RS showing length of primaries and routing required to fit the cat


Video from the dyno so you can see and hear the awesomeness! You also get a good shot of how the headers are routed with the wheel off!

Dundon Street Headers on 991 GT3 - YouTube