Killer B Motorsport 4-1 Holy Header w/EGT Bung 2-Bolt Coated Subaru EJ Models (inc. 2002-2014 WRX / 2004+ STI) | HH-2BOLT-SWAIN-EGT

If you want some of the best components available when modifying your vehicle, then you will be satisfied with a great product from Killer B Motorsports. This introduction is for the 321 Stainless 2-Bolt Header that will be Swain Coated for extra protection against heat and corrosion. This is a great option because the header is designed around the oil pan, and it will help reduce your oil temperatures for improved performance. 

Killer B Motorsport manufactured these exhaust manifolds using the latest technologies which include state-of-the-art CAD software and simulations to help determine optimal design to develop as much power as possible out of a header design. This means that you will get more horsepower and torque throughout the entire RPM range. Additionally, this header has been designed with short as possible primaries with a single secondary which helps significantly decrease header volume allowing exhaust gas pressures to build quickly. 

The symmetrical 4-1 design maintains high and consistent exhaust velocity as RPMs rise which reduces turbo lag and improves throttle response. The more noticeable gains are the ability to hold more power higher into the revs. And like all Killer B Motorsport exhaust components, one of their greater attributes is the quality of the welds. You don’t have to second-guess the quality of their welds as they put forth much emphasis on the quality of the materials they use when developing their products.

• Large Secondary: The Holy Header was designed for higher flow rates with a 2.5″ secondary
• Cast Collector: Stronger than tubing, made from 347 (321 stainless) with a true high-velocity merge design
• Short Equal Length Primaries: The shortest possible length primaries you can have on an equal-length header for improved transient response
• Symmetrical Primary Design: All primaries have a similar tube length and bend geometry
• Smooth Mandrel Bends: Large radius bends utilize a mandrel for smooth non-restrictive flow
• Thick Walled 321 Stainless Steel Construction For Longer Life: 321 is alloyed with titanium to have higher strength and toughness at elevated temperatures
• Equal-length in design
• This header will come coated, with the EGT bung located on cylinder #4