Description

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.

These headers have EGT bungs added to each runner (4 total).

Specifications

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.


*We do not warranty wrapped headers.

Compatibility

  • 1989 Subaru Liberty BC/BF
  • 1990 Subaru Liberty BC/BF
  • 1991 Subaru Liberty BC/BF
  • 1992 Subaru Liberty BC/BF
  • 1993 Subaru Liberty BC/BF
  • 1993 Subaru Liberty BD/BG
  • 1994 Subaru Impreza GC8/GF8 (Non-Turbo)
  • 1994 Subaru Liberty BD/BG
  • 1994 Subaru STI GC8
  • 1994 Subaru WRX GC8/GF8
  • 1995 Subaru Impreza GC8/GF8 (Non-Turbo)
  • 1995 Subaru Liberty BD/BG
  • 1995 Subaru STI GC8
  • 1995 Subaru WRX GC8/GF8
  • 1996 Subaru Impreza GC8/GF8 (Non-Turbo)
  • 1996 Subaru Liberty BD/BG
  • 1996 Subaru STI GC8
  • 1996 Subaru WRX GC8/GF8
  • 1997 Subaru Forester SF
  • 1997 Subaru Impreza GC8/GF8 (Non-Turbo)
  • 1997 Subaru Liberty BD/BG
  • 1997 Subaru STI GC8
  • 1997 Subaru WRX GC8/GF8
  • 1998 Subaru Forester SF
  • 1998 Subaru Impreza GC8/GF8 (Non-Turbo)
  • 1998 Subaru Liberty BD/BG
  • 1998 Subaru Liberty BE/BH
  • 1998 Subaru STI GC8
  • 1998 Subaru WRX GC8/GF8
  • 1999 Subaru Forester SF
  • 1999 Subaru Impreza GC8/GF8 (Non-Turbo)
  • 1999 Subaru Liberty BE/BH
  • 1999 Subaru STI GC8
  • 1999 Subaru WRX GC8/GF8
  • 2000 Subaru Forester SF
  • 2000 Subaru Impreza GC8/GF8 (Non-Turbo)
  • 2000 Subaru Liberty BE/BH
  • 2000 Subaru STI GC8
  • 2000 Subaru WRX GC8/GF8
  • 2001 Subaru Forester SF
  • 2001 Subaru Impreza GD/GG (Non-Turbo)
  • 2001 Subaru Liberty BE/BH
  • 2001 Subaru STI GDB
  • 2001 Subaru WRX GDA/GGA
  • 2002 Subaru Forester SF
  • 2002 Subaru Impreza GD/GG (Non-Turbo)
  • 2002 Subaru Liberty BE/BH
  • 2002 Subaru STI GDB
  • 2002 Subaru WRX GDA/GGA
  • 2003 Subaru Forester SG (Non-Turbo)
  • 2003 Subaru Forester SG XT (Turbo)
  • 2003 Subaru Impreza GD/GG (Non-Turbo)
  • 2003 Subaru Liberty BE/BH
  • 2003 Subaru STI GDB
  • 2003 Subaru WRX GDA/GGA
  • 2004 Subaru Forester SG (Non-Turbo)
  • 2004 Subaru Forester SG XT (Turbo)
  • 2004 Subaru Impreza GD/GG (Non-Turbo)
  • 2004 Subaru Liberty BL/BP (Non-Turbo)
  • 2004 Subaru Liberty BL/BP (Turbo)
  • 2004 Subaru STI GDB
  • 2004 Subaru WRX GDA/GGA
  • 2005 Subaru Forester SG (Non-Turbo)
  • 2005 Subaru Forester SG XT (Turbo)
  • 2005 Subaru Impreza GD/GG (Non-Turbo)
  • 2005 Subaru Liberty BL/BP (Non-Turbo)
  • 2005 Subaru Liberty BL/BP (Turbo)
  • 2005 Subaru STI GDB
  • 2005 Subaru WRX GDA/GGA
  • 2006 Subaru Forester SG (Non-Turbo)
  • 2006 Subaru Forester SG XT (Turbo)
  • 2006 Subaru Impreza GD/GG (Non-Turbo)
  • 2006 Subaru Liberty BL/BP (Non-Turbo)
  • 2006 Subaru Liberty BL/BP (Turbo)
  • 2006 Subaru STI GDB
  • 2006 Subaru WRX GDA/GGA
  • 2007 Subaru Forester SG (Non-Turbo)
  • 2007 Subaru Forester SG XT (Turbo)
  • 2007 Subaru Impreza GD/GG (Non-Turbo)
  • 2007 Subaru Liberty BL/BP (Non-Turbo)
  • 2007 Subaru Liberty BL/BP (Turbo)
  • 2007 Subaru STI GDB
  • 2007 Subaru WRX GDA/GGA
  • 2008 Subaru Forester SG (Non-Turbo)
  • 2008 Subaru Forester SG XT (Turbo)
  • 2008 Subaru Forester SH (Non-Turbo)
  • 2008 Subaru Forester SH XT (Turbo)
  • 2008 Subaru Impreza GE/GH (Non-Turbo)
  • 2008 Subaru Liberty BL/BP (Non-Turbo)
  • 2008 Subaru Liberty BL/BP (Turbo)
  • 2008 Subaru STI GRF
  • 2008 Subaru WRX GEE/GHE
  • 2009 Subaru Forester SH (Non-Turbo)
  • 2009 Subaru Forester SH XT (Turbo)
  • 2009 Subaru Impreza GE/GH (Non-Turbo)
  • 2009 Subaru Liberty BL/BP (Non-Turbo)
  • 2009 Subaru Liberty BL/BP (Turbo)
  • 2009 Subaru STI GRF
  • 2009 Subaru WRX GEE/GHE
  • 2010 Subaru Forester SH (Non-Turbo)
  • 2010 Subaru Forester SH XT (Turbo)
  • 2010 Subaru Impreza GE/GH (Non-Turbo)
  • 2010 Subaru Liberty BM/BR (Non-Turbo)
  • 2010 Subaru Liberty BM/BR (Turbo)
  • 2010 Subaru STI GRF
  • 2010 Subaru WRX GEE/GHE
  • 2011 Subaru Forester SH (Non-Turbo)
  • 2011 Subaru Forester SH XT (Turbo)
  • 2011 Subaru Impreza GE/GH (Non-Turbo)
  • 2011 Subaru Liberty BM/BR (Non-Turbo)
  • 2011 Subaru Liberty BM/BR (Turbo)
  • 2011 Subaru STI GVF/GRF
  • 2011 Subaru WRX GEE/GHE
  • 2011 Subaru WRX GVE/GRE
  • 2012 Subaru Forester SH (Non-Turbo)
  • 2012 Subaru Forester SH XT (Turbo)
  • 2012 Subaru Liberty BM/BR (Non-Turbo)
  • 2012 Subaru Liberty BM/BR (Turbo)
  • 2012 Subaru STI GVF/GRF
  • 2012 Subaru WRX GVE/GRE
  • 2013 Subaru Forester SH (Non-Turbo)
  • 2013 Subaru Forester SH XT (Turbo)
  • 2013 Subaru Liberty BM/BR (Non-Turbo)
  • 2013 Subaru Liberty BM/BR (Turbo)
  • 2013 Subaru STI GVF/GRF
  • 2013 Subaru WRX GVE/GRE
  • 2014 Subaru Liberty BM/BR (Non-Turbo)
  • 2014 Subaru Liberty BM/BR (Turbo)
  • 2014 Subaru STI GVF/GRF
  • 2014 Subaru WRX GVE/GRE
  • 2015 Subaru STI VAB
  • 2016 Subaru STI VAB
  • 2017 Subaru STI VAB
  • 2018 Subaru STI VAB
  • 2019 Subaru STI VAB
  • 2020 Subaru STI VAB
  • 2021 Subaru STI VAB

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.

These headers have EGT bungs added to each runner (4 total).

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.


*We do not warranty wrapped headers.

  • 1989 Subaru Liberty BC/BF
  • 1990 Subaru Liberty BC/BF
  • 1991 Subaru Liberty BC/BF
  • 1992 Subaru Liberty BC/BF
  • 1993 Subaru Liberty BC/BF
  • 1993 Subaru Liberty BD/BG
  • 1994 Subaru Impreza GC8/GF8 (Non-Turbo)
  • 1994 Subaru Liberty BD/BG
  • 1994 Subaru STI GC8
  • 1994 Subaru WRX GC8/GF8
  • 1995 Subaru Impreza GC8/GF8 (Non-Turbo)
  • 1995 Subaru Liberty BD/BG
  • 1995 Subaru STI GC8
  • 1995 Subaru WRX GC8/GF8
  • 1996 Subaru Impreza GC8/GF8 (Non-Turbo)
  • 1996 Subaru Liberty BD/BG
  • 1996 Subaru STI GC8
  • 1996 Subaru WRX GC8/GF8
  • 1997 Subaru Forester SF
  • 1997 Subaru Impreza GC8/GF8 (Non-Turbo)
  • 1997 Subaru Liberty BD/BG
  • 1997 Subaru STI GC8
  • 1997 Subaru WRX GC8/GF8
  • 1998 Subaru Forester SF
  • 1998 Subaru Impreza GC8/GF8 (Non-Turbo)
  • 1998 Subaru Liberty BD/BG
  • 1998 Subaru Liberty BE/BH
  • 1998 Subaru STI GC8
  • 1998 Subaru WRX GC8/GF8
  • 1999 Subaru Forester SF
  • 1999 Subaru Impreza GC8/GF8 (Non-Turbo)
  • 1999 Subaru Liberty BE/BH
  • 1999 Subaru STI GC8
  • 1999 Subaru WRX GC8/GF8
  • 2000 Subaru Forester SF
  • 2000 Subaru Impreza GC8/GF8 (Non-Turbo)
  • 2000 Subaru Liberty BE/BH
  • 2000 Subaru STI GC8
  • 2000 Subaru WRX GC8/GF8
  • 2001 Subaru Forester SF
  • 2001 Subaru Impreza GD/GG (Non-Turbo)
  • 2001 Subaru Liberty BE/BH
  • 2001 Subaru STI GDB
  • 2001 Subaru WRX GDA/GGA
  • 2002 Subaru Forester SF
  • 2002 Subaru Impreza GD/GG (Non-Turbo)
  • 2002 Subaru Liberty BE/BH
  • 2002 Subaru STI GDB
  • 2002 Subaru WRX GDA/GGA
  • 2003 Subaru Forester SG (Non-Turbo)
  • 2003 Subaru Forester SG XT (Turbo)
  • 2003 Subaru Impreza GD/GG (Non-Turbo)
  • 2003 Subaru Liberty BE/BH
  • 2003 Subaru STI GDB
  • 2003 Subaru WRX GDA/GGA
  • 2004 Subaru Forester SG (Non-Turbo)
  • 2004 Subaru Forester SG XT (Turbo)
  • 2004 Subaru Impreza GD/GG (Non-Turbo)
  • 2004 Subaru Liberty BL/BP (Non-Turbo)
  • 2004 Subaru Liberty BL/BP (Turbo)
  • 2004 Subaru STI GDB
  • 2004 Subaru WRX GDA/GGA
  • 2005 Subaru Forester SG (Non-Turbo)
  • 2005 Subaru Forester SG XT (Turbo)
  • 2005 Subaru Impreza GD/GG (Non-Turbo)
  • 2005 Subaru Liberty BL/BP (Non-Turbo)
  • 2005 Subaru Liberty BL/BP (Turbo)
  • 2005 Subaru STI GDB
  • 2005 Subaru WRX GDA/GGA
  • 2006 Subaru Forester SG (Non-Turbo)
  • 2006 Subaru Forester SG XT (Turbo)
  • 2006 Subaru Impreza GD/GG (Non-Turbo)
  • 2006 Subaru Liberty BL/BP (Non-Turbo)
  • 2006 Subaru Liberty BL/BP (Turbo)
  • 2006 Subaru STI GDB
  • 2006 Subaru WRX GDA/GGA
  • 2007 Subaru Forester SG (Non-Turbo)
  • 2007 Subaru Forester SG XT (Turbo)
  • 2007 Subaru Impreza GD/GG (Non-Turbo)
  • 2007 Subaru Liberty BL/BP (Non-Turbo)
  • 2007 Subaru Liberty BL/BP (Turbo)
  • 2007 Subaru STI GDB
  • 2007 Subaru WRX GDA/GGA
  • 2008 Subaru Forester SG (Non-Turbo)
  • 2008 Subaru Forester SG XT (Turbo)
  • 2008 Subaru Forester SH (Non-Turbo)
  • 2008 Subaru Forester SH XT (Turbo)
  • 2008 Subaru Impreza GE/GH (Non-Turbo)
  • 2008 Subaru Liberty BL/BP (Non-Turbo)
  • 2008 Subaru Liberty BL/BP (Turbo)
  • 2008 Subaru STI GRF
  • 2008 Subaru WRX GEE/GHE
  • 2009 Subaru Forester SH (Non-Turbo)
  • 2009 Subaru Forester SH XT (Turbo)
  • 2009 Subaru Impreza GE/GH (Non-Turbo)
  • 2009 Subaru Liberty BL/BP (Non-Turbo)
  • 2009 Subaru Liberty BL/BP (Turbo)
  • 2009 Subaru STI GRF
  • 2009 Subaru WRX GEE/GHE
  • 2010 Subaru Forester SH (Non-Turbo)
  • 2010 Subaru Forester SH XT (Turbo)
  • 2010 Subaru Impreza GE/GH (Non-Turbo)
  • 2010 Subaru Liberty BM/BR (Non-Turbo)
  • 2010 Subaru Liberty BM/BR (Turbo)
  • 2010 Subaru STI GRF
  • 2010 Subaru WRX GEE/GHE
  • 2011 Subaru Forester SH (Non-Turbo)
  • 2011 Subaru Forester SH XT (Turbo)
  • 2011 Subaru Impreza GE/GH (Non-Turbo)
  • 2011 Subaru Liberty BM/BR (Non-Turbo)
  • 2011 Subaru Liberty BM/BR (Turbo)
  • 2011 Subaru STI GVF/GRF
  • 2011 Subaru WRX GEE/GHE
  • 2011 Subaru WRX GVE/GRE
  • 2012 Subaru Forester SH (Non-Turbo)
  • 2012 Subaru Forester SH XT (Turbo)
  • 2012 Subaru Liberty BM/BR (Non-Turbo)
  • 2012 Subaru Liberty BM/BR (Turbo)
  • 2012 Subaru STI GVF/GRF
  • 2012 Subaru WRX GVE/GRE
  • 2013 Subaru Forester SH (Non-Turbo)
  • 2013 Subaru Forester SH XT (Turbo)
  • 2013 Subaru Liberty BM/BR (Non-Turbo)
  • 2013 Subaru Liberty BM/BR (Turbo)
  • 2013 Subaru STI GVF/GRF
  • 2013 Subaru WRX GVE/GRE
  • 2014 Subaru Liberty BM/BR (Non-Turbo)
  • 2014 Subaru Liberty BM/BR (Turbo)
  • 2014 Subaru STI GVF/GRF
  • 2014 Subaru WRX GVE/GRE
  • 2015 Subaru STI VAB
  • 2016 Subaru STI VAB
  • 2017 Subaru STI VAB
  • 2018 Subaru STI VAB
  • 2019 Subaru STI VAB
  • 2020 Subaru STI VAB
  • 2021 Subaru STI VAB

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