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...

This is the most complete, well-rounded power package around for the 991.2 GT3 4.0L. With careful consideration and many design, engineering and tuning hours, we have extracted impressive power, torque and drive-ability out of the 991.2 GT3 4.0L engine. The best part: no compromises. ...

38lbft and 50whp gains (with Race Headers) Includes: Street Headers OEM Touring Airbox 93mm TB/Center Plenum Optional Lifetime Muffler   Only Race Header/Lifetime Muffler/ Touring Airbox/ 93mm Center Plenum Dyno available.

Dundon Street (Catted) tuned length headers and valved side delete exhaust system for the 991.2 GT3! 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...

Dundon Street (Catted) tuned length headers and valved side delete exhaust system for the 991.1 GT3! 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...

Available in OEM lower flow tube size for stock muffler or 3" lower flow tube size for use with Dundon Lifetime Mufflers 3" Lower Flow Path Offers 44% improvement in flow over stock 20% reduction in pressure drop over stock Use with Loud Muffler...

Our Megaphone crack pipe features... Inconel 625 Megaphones for enhanced wave strength (more power) Full 3.5" X Pipe merge   YOU HAVE BEEN WARNED! This system sounds badass, BUT…. It was designed for race cars, and as such, it is UNCOMPROMISING It drones at...

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...

Free up power and add some beauty to your engine bay with the Dundon Motorsports Carbon Fiber Dual Cone Airbox. On a stock car this airbox will free up about 5-7whp. On a Dundon Header equipped car, this airbox is good for about 8-10...

We based this design on the fabled 997 4.0L GT3RS.  It features dual conical air filters from the 4.0RS.  In order for you to keep your stock decklid we created a balance pipe in the bottom area of the airbox to allow air to...