Killer B FA20 Twin Scroll Equal Length Headers - Fits Subaru WRX 2015-2019

Add more power to your FA20 Turbocharged Subaru! The factory OEM manifold is designed as a cost-effective component whereas this Killer B Motorsport Performance Header is designed with the goal of maximizing exhaust gas performance and increasing power. The equal length twin-scroll design improves exhaust gas scavenging, increasing the engine’s ability to make power.

321 Stainless Steel used in this manifold offers numerous benefits over common 304 Stainless Steel. 321 is made with the alloying element Titanium. This increases the material cost significantly, but for a turbocharged application, offers advantages over 304. 321 offers Increased strength and toughness at elevated temperatures, making it less likely to fatigue and crack. 321 was developed by the aircraft industry specifically to address longevity issues with pressurized turbocharged manifolds; addressing cracking from lower quality grades of stainless steel like 304. 321 Stainless Steel conducts less heat that 304 Stainless Steel. This means a 321 header will deliver more thermal energy to the turbocharger, improving responsiveness and efficiency. 

Large-Radius Free-Flowing Mandrel-Formed Bends maximize flow potential. Common 1D bends are easy to come by, inexpensive and provide the least performance. Advanced design, simulation, and testing was used to verify maximum performance capability of this header (further verified by independent testing).

Quality and Craftsmanship come in ½” thick billet precision CNC-machined flanges for exceptional durability and ground flat for leak-free service. TIG-welded to aircraft quality standards and ground smooth to assure turbulence-free exhaust gas flow. 

Made in the USA. Every raw material used from start to finish; molten metal to finished product, is certified to have been made in the USA. Every Killer B product includes a Limited Lifetime Warranty from Killer B.