991.1 GT3 Long Tube Street Header Exhaust System
991.1 GT3 Long Tube Street Header Exhaust System 991.1 GT3 Long Tube Street Header Exhaust System 991.1 GT3 Long Tube Street Header Exhaust System 991.1 GT3 Long Tube Street Header Exhaust System 991.1 GT3 Street Headers Dyno Graph
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$7,295.00

* Muffler shown is not included with the system, only to see how the system goes together!
 

Dundon Street (Catted) tuned length headers and valved side delete exhaust system for the 991.1 GT3  are available now!  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 a metal core spiral wound 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 30whp gains on the 991.1 GT3   This is the most power from a catted 991.1 GT3 Exhaust

 

 

 

The Dundon Street Headers on 991 GT3 make
434whp peak
30whp at 8215rpm
26lbft, 23whp gains at 4586rpm

You get everything you love about the Dundon Race Headers, 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!



 



991 GT3 Dundon Street (Catted) 434whp peak

991 GT3 Dundon Street (Catted) System vs Stock


991 GT3 Dundon Street (Catted) 26lbft and 23whp at 4500rpm

991 GT3 Dundon Street (Catted) vs Stock, 26wtq and 23whp at 4500 RPM

991 GT3 Dundon Street (Catted) 30whp max gains

991 GT3 Dundon Street (Catted) 30whp max gains at 8215RPM


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...



As you can see to get the length we wanted we had to go up, anything that can bolt up to the stock location is leaving power on the table...



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