Killer B Motorsport Twin Scroll Header for 2015+ Subaru WRX

On: Friday, July 7, 2017

Killer B Motorsport Twin Scroll Header for the 2015+ Subaru WRX is Now Available at Limitless Motorsports!

Add more power to your FA20 Turbocharged Subaru! The factory OEM manifold is designed as a cost-effective component, however the Killer B Motorsport Performance Header is designed with the goal of maximizing exhaust gas performance and increasing power.

Equal length twin scroll design improves exhaust gas scavenging, increasing the engine’s ability to make power. This header is available for the traditional OEM (or OEM style) turbocharger setup, or with a dual external wastegate ported version to deliver maximum performance potential.

321 Stainless Steel Construction

This material offers 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. It 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
These crucial elements maximize flow potential of the header. Common 1D bends are easy to come by, inexpensive and provide the least performance. Advanced design, simulation, and testing were used to verify maximum performance capability of our header—further verified by independent testing.


Quality and Craftsmanship
These headers are made with 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 ensure smooth turbulent-free gas flow.


Made in the USA
Every raw material used from molten metal to finished product is certified made in the USA. We stand behind our products and include a Limited Lifetime Warranty.


2015+ Subaru WRX (w/ turbocharged FA20 engine)


Part Numbers
FAWRTSH - Twin Scroll Header
FAWRTSH-EWG - Twin Scroll Header w/ External Wastegate
FAWRTSH-SWAIN - Twin Scroll Header w/ Swain Coating
FAWRTSH-EWG-SWAIN - Twin Scroll Header w/ External Wastegate & Swain Coating


For more information on the products, feel free to contact us HERE!


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