EL 4-1 Holy Header 2-Bolt Manifold (COAT NO BUNG)

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Collections: Headers & Manifolds

Product type: Performance Headers - EJ Series

Vendor: Killer B Motorsport

Tags: 2-Bolt, 2002 wrx, 2003 wrx, 2004 forester, 2004 legacy, 2004 outback, 2004 sti, 2004 wrx, 2005 forester, 2005 legacy, 2005 outback, 2005 sti, 2005 wrx, 2006 forester, 2006 legacy, 2006 outback, 2006 sti, 2006 wrx, 2007 forester, 2007 legacy, 2007 outback, 2007 sti, 2007 wrx, 2008 forester, 2008 legacy, 2008 outback, 2008 sti, 2008 wrx, 2009 forester, 2009 legacy, 2009 outback, 2009 sti, 2009 wrx, 2010 forester, 2010 sti, 2010 wrx, 2011 forester, 2011 sti, 2011 wrx, 2012 forester, 2012 sti, 2012 wrx, 2013 forester, 2013 sti, 2013 wrx, 2014 sti, 2014 wrx, 2015 sti, 2016 sti, 2017 sti, 2018 sti, 2019 sti, 4-1, EL, Header, Holy, Manifold

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$2,150.00

The Killer B Motorsport Holy Header was developed using state of the art CAD software & simulations to determine optimal design to increase power as much as possible throughout the rev range. Short as possible primaries with a single secondary significantly decrease header volume allowing exhaust gas pressure to build quickly. Symmetrical 4-1 design maintains high and consistent exhaust velocity as RPMs rise. You can expect faster spool up time compared to long primary/double secondary designs. A difference you will immediately notice in throttle/boost response and the ability to hold more power higher into the revs.

Cast Collector. The collector is thick walled cast 347 (321) stainless. The casting removes several welds, each weld removed is one less flow disruption (reduced turbulence). The casting has features milled into it that assure the primary tubes fit VERY concentric every time. Using a casting allows the collector to be designed as a true high velocity merge vs tubing that can only be formed a little bit, and not ideally. The casting is thicker/stronger than formed tube and holds heat better.

Short Equal Length Primaries. The shortest possible length primaries you can have on an Equal Length header. Short means less header volume and quick spool up.

Symmetrical Primary Design. All primaries have a similar tube length AND bend geometry. This keeps the pulse velocities high and consistent compared to equal length headers with different (non-symmetrical) primary tubing geometry.

Smooth Mandrel Bends. All of the bends utilize a mandrel for smooth non-restrictive flow. Not only that, we use the largest bends possible at every location. It would be cheaper to use 2” bends everywhere, like others do, but that’s not going to give the best performance.

Thick Walled 321 Stainless Steel Construction for Long Life. 321 is alloyed with titanium, costs more, a lot more, but it’s the ideal material for high temperature turbocharged applications. Would 304 stainless work, yes, but the temperatures on our turbocharged cars can exceed the limits of 304 stainless enough to make them brittle and crack. 321 stainless steel has higher strength and toughness at elevated temperatures. It was developed by the aircraft industry specifically to address 304 stainless manifolds that were cracking. Killer B Motorsport is the only company that manufactures full 321 headers.

High Heat Retention. 321 stainless steel conducts less heat than 304 stainless steel. The short primaries and properly sized secondaries also pull less heat from the exhaust gasses increasing turbine efficiency. Large tubing headers expose the exhaust gasses to more surface area transmitting more heat and reducing exhaust energy. You can also ceramic coat (and keep the warranty) without exceeding the temperature range like you can with 304 stainless.

Made in the USA and Killer B quality! Every Header setup is inspected, assembled and pressure tested before it ships to assure a leak free setup!

Works with OEM EJ25 Oil Pans, and Killer B Motorsport Performance Aluminum Oil Pan! Fits All WRX & STi EJ Series Engines. Designed to work with OEM location turbo.

Vehicle Fitment 2004-2019 STi, 2002-2014 WRX, 2004-2013 Forester XT, 2004-2009 Outback XT, 2004-2009 Legacy GT

 

SwainTech Multi-Layer Ceramic Coating (additional 8 weeks)