aFe Power's introduces the Twisted Steel headers for the 2012-2016 Porsche 911 (991). In testing, the headers produced a max gain of +29 horsepower and +37 ft. lbs. of torque verified by our in house dyno. These headers are constructed of near equal length mandrel-bent 1-7/8" 16-gauge, 304 stainless steel tubing with thick flanges to ensure a leak free seal. The smooth curves and increased diameter of the headers helps remove restriction and keeps exhaust gas flowing smoothly for improved performance and durability. To eliminate dead space that can cause turbulence and hinder flow 3-to-1 mitered collectors and optimized tube lengths are used for true pulse control technology improving flow and performance. These headers use 400 CPSI catalytic converters and includes all components for a hassle-free installation with no modifications necessary.
100% TIG-Welded by certified craftsmen for race proven strength and durability. TIG-Welding provides the strongest welds reducing stress cracks.
Dual High Flow Catalytic Converters:
400 CPSI catalytic converters are used for maximum flow.
This is a Race Only product that is to be used solely for competition, it cannot be used on vehicles that are operated on public streets, roads or highways. Its use is limited to closed-course and open-course racing that is formally sanctioned by a recognized racing organization. Any other use, including recreational off-road use, could be in violation of local, state and federal laws. To complete the purchase of this item, aFe Power competition acknowledgement/liability release form must be filled out and submitted.
Retains Factory Sensors:
aFe has designed this system to retain all your factory sensors for a hassle free installation.
Mitered collectors not only extend the tube lengths and decrease turbulence, but provide optimal exhaust scavenging. The result is increased horsepower, torque and improved throttle response.
304 SS Construction:
These headers are constructed of durable CNC mandrel bent brushed 304 stainless steel tubing for maximum performance, corrosion resistance, strength and resistance to cracking.
This product is not currently CARB exempt and is not available for purchase in California or for use on any vehicle registered with the California Department of Motor Vehicles.
All 911 Carrera (991) Models with Naturally Aspirated Engines (Will Not Fit Turbo or Turbo S)
aFe headers are engineered and manufactured in our Corona, California manufacturing facility.
Year Make Model SubModel Engine Fuel 2012-2016 Porsche 911 Carrera 991 H6 3.4L Gas 2012-2016 Porsche 911 Carrera S 991 H6 3.8L Gas 2013-2016 Porsche 911 Carrera 4 991 H6 3.4L Gas 2013-2016 Porsche 911 Carrera 4S 991 H6 3.8L Gas
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