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 40whp max gains on the 991.2 GT3RS, This is the most power from a catted 991.2 GT3RS Exhaust system.
The Dundon Street Headers on 991.2 GT3RS 40ftlbs at 4300rpm 40whp at 8800rpm 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!
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... Dundon 991 GT3/RS Street Dundon 991 GT3/RS showing length of primaries and routing required to fit the cat
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