Our newest product for the Porsche 991 Carrera is these high flow race headers. These headers are a big change in design compared to stock which now feature a 3 into 1 merge collector on either bank. The all stainless steel headers have an equal length design to improve the flow from the engine. Available as race only, we did initial tests with cats. To keep our modular focus, these headers are a direct OEM replacement. They allow you to run the stock main muffler and secondary mufflers or use our secondary bypass pipes.
The main objective was to gain power that the 991 was missing in certain areas of the curve. So having a baseline of the car stock with around 342.8HP, we gave these bad boys a run. An immediate difference was the sound. These headers really enhanced the sound of the 3.8L DFI engine. It was very GT3 sounding. When lifting off the throttle, it gave a little bit of back rumble. Without knowing the numbers, the dyno runs could be audibly and noticeably felt smoother through the RPM's. Once we finished our 3 runs, we looked at the graph and were quite amazed. Stock, the car has a very lumpy power curve. With our special 3 to 1 merge collector and equal length tube design, the power band became extremely linear and consistent with no hesitation or issues. In some areas of the curve it gained 30ft/lbs of torque! The Agency Power 991 Carrera Headers gained a peak of 11HP and 12ft/lbs of torque.
To help prevent a check engine light, we have included a O2 bung spacer. This raises the sensor out of the exhaust stream. However without tuning or the ability to raise the secondary O2 limits, you will most likely have a check engine light.
- These headers fit both the Porsche 991 Carrera and Carrera S from 12-15.
- All Agency Power products come with a LIMITED LIFETIME warranty when you fill out this form HERE.
- This product is for Racing Competition only and is not legal for use in highway or street vehicles or other non-racing competition off-road vehicles.