We found in our exhaust development and testing of the 991.2 GT3 and RS that they are intake limited both through the factory airfilter box and through the 82mm Throttle body. A bit of history. The Bosch 82mm Throttle body is the largest Bosch...

Package Includes: Street Headers (w/ cats) Cobb AP w/ Pro Tune 997 GT3 Intake Manifold w/ 93mm Throttle Body   The Dundon Street headers by itself give a huge improvement to performance and the overall sound of the system, combined with the Cobb AP...

Package Includes: Street Headers (w/ cats) Cobb AP w/ Pro Tune Dundon Resonance Intake Manifold w/ 100mm Throttle Body 997.1 Secondary Air Injection Retrofit (required for 997.2 cars) The Dundon Street headers by itself give a huge improvement to performance and the overall sound...

State-of-the-art 3D-printed Titanium Tips in a new "Vented" design, built to bolt to a 321SS Dundon Muffler.