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Agency Power Catless Race Headers - 12-15 991 Carrera

SKU. 0D65E    Part No. AP-991-175  

Agency Power AP-991-175 Catless Race Headers - 12-15 991 Carrera Image1
  • Overview

    Quick Info

    • Stainless Steel

    • OEM Replacement

    • Improved Flow Engine

    Product Details

    Our newest product for the Porsche 991 Carrera is these high flow catless 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 catless 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 RPMs. 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.


    • 25 lbs Weight
    • 28 x 9 x 16 in Dimension
    • Black Ceramic, Stainless Exhaust options


    • Porsche 991 Carrera
    • Carrera S from 12-15
  • Specifications
    Brand Agency Power
    Part Number AP-991-175
    Category Vehicle Parts ▸
    Exhaust ▸
    Item Code 0D65E
    Length 28 in.
    Width 16 in.
    Height 9 in.
    Weight 25.00 lb.
    Created Friday, May 22, 2015
    Last Updated Friday, December 21, 2018
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