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  See more parts for Subaru Baja
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Killer B Motorsport 321 Stainless Holy Header/Up-Pipe w/ SwainTech Multi-Layer Ceramic Coating Subaru WRX | STi EJ Series Engine - HH4-1-SWAIN
Killer B Motorsport 321 Stainless Holy Header/Up-Pipe w/ SwainTech Multi-Layer Ceramic Coating Subaru WRX | STi EJ Series Engine - HH4-1-SWAIN - Image 6 Killer B Motorsport 321 Stainless Holy Header/Up-Pipe w/ SwainTech Multi-Layer Ceramic Coating Subaru WRX | STi EJ Series Engine - HH4-1-SWAIN - Image 2 Killer B Motorsport 321 Stainless Holy Header/Up-Pipe w/ SwainTech Multi-Layer Ceramic Coating Subaru WRX | STi EJ Series Engine - HH4-1-SWAIN - Image 3 Killer B Motorsport 321 Stainless Holy Header/Up-Pipe w/ SwainTech Multi-Layer Ceramic Coating Subaru WRX | STi EJ Series Engine - HH4-1-SWAIN - Image 4 Killer B Motorsport 321 Stainless Holy Header/Up-Pipe w/ SwainTech Multi-Layer Ceramic Coating Subaru WRX | STi EJ Series Engine - HH4-1-SWAIN - Image 5 Killer B Motorsport 321 Stainless Holy Header/Up-Pipe w/ SwainTech Multi-Layer Ceramic Coating Subaru WRX | STi EJ Series Engine - HH4-1-SWAIN - Image 6
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 decrease header volume significantly, allowing exhaust gas pressure to quickly build. 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 that you will immediately notice in throttle/boost response and the ability to hold more power higher into the revs.

Features :
  • Cast Collector. The collector is thick walled cast 347 (321) stainless. The casting removes several welds, and 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 as opposed to tubing that can only be formed a little bit, and not ideally. The casting is thicker/stronger than formed tube and also holds heat better.
  • Short Equal Length Primaries. The shortest possible length primaries that 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 which costs more, a lot more, but it's the ideal material for high temperature turbocharged applications. 304 stainless would 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, which is why 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 our headers (and keep the warranty) without exceeding the temperature range like you can with 304 stainless.
  • V-Band Up-Pipe Connection. Why V-Band? Fast, easy, no gasket, no leaks, perfectly concentric alignment of tubes for no disruption of flow, what's not to like!
  • Up-Pipe included. Of course it comes with an Up-Pipe! This header was designed as a complete system. Using other up-pipes would only compromise performance, and nobody wants that.
  • Works with OEM EJ25 Oil Pans and Killer B Motorsport Performance Aluminum Oil Pans!
  • Fits All WRX & STi EJ Series Engines. Designed to work with OEM location turbo.
  • Made in the USA!
Install Instructions :Fitments :
  • Subaru WRX | STi EJ Series Engine
Notes :
  • We do not warranty wrapped headers.

Other Part Numbers:
Killer B #KILHH4-1-SWAIN

Proposition 65

⚠ WARNING: Cancer and Reproductive Harm
https://www.P65Warnings.ca.gov

Vehicle Make/Model
Subaru Baja 2003 Base
Subaru Baja 2003-2006 Sport
Subaru Baja 2004-2006 Turbo
Subaru Forester 1998-2002 Base
Subaru Forester 1998-2002 L
Subaru Forester 1998-2002 S
Subaru Forester 2003-2005, 2007, 2009-2011 XS
Subaru Forester 2003-2011 X
Subaru Forester 2004-2005, 2008-2009 XT
Subaru Forester 2005, 2010-2011 XT Premium
Subaru Forester 2005 XS L.L. Bean Edition
Subaru Forester 2006-2008 X L.L. Bean Edition
Subaru Forester 2006-2010 XT Limited
Subaru Forester 2007, 2009-2011 XSL
Subaru Forester 2008 2.5 XS
Subaru Forester 2008 2.5 XS Premium
Subaru Forester 2008 Sports 2.5 X
Subaru Forester 2008 2.5 XT
Subaru Forester 2008 Sports 2.5 XT
Subaru Forester 2008 2.5 X
Subaru Forester 2008 Anniversary Edition
Subaru Forester 2009-2011 X Premium
Subaru Forester 2009-2011 X Touring
Subaru Forester 2009-2011 X Limited
Subaru Forester 2010-2011 XT Sports
Subaru Forester 2011 XT Touring
Subaru Impreza 2002-2004 Outback
Subaru Impreza 2002-2004 TS
Subaru Impreza 2002-2005 RS
Subaru Impreza 2005-2011 Outback Sport
Subaru Impreza 2006-2011 2.5i
Subaru Impreza 2008 2.0R
Subaru Impreza 2008-2014 Sport
Subaru Impreza 2009-2010 2.5 GT
Subaru Impreza 2009-2012 R
Subaru Impreza 2010-2011 2.5i Premium
Subaru Impreza 2010 2.5i Limited
Subaru Impreza 2011 XV
Subaru Impreza 2012-2014 Sport Limited
Subaru Impreza 2012-2014 Touring
Subaru Impreza 2012-2014 Limited
Subaru Impreza 2012-2014 WRX Premium
Subaru Impreza 2012-2014 Base
Subaru Impreza 2012-2014 Sport Premium
Subaru Impreza 2012-2014 Premium
Subaru Impreza 2012-2014 WRX
Subaru Impreza 2012-2014 WRX Limited
Subaru Impreza 2013-2014 I Sport
Subaru Impreza 2013-2014 WRX STI
Subaru Impreza 2013-2014 WRX STI Limited
Subaru Impreza 2013-2014 i
Subaru Impreza 2014 I Limited
Subaru Legacy 1998-2005 GT
Subaru Legacy 1998-2000 Brighton
Subaru Legacy 1998, 2000-2002, 2005 GT Limited
Subaru Legacy 1998-2004 L
Subaru Legacy 1998 Postal
Subaru Legacy 1998-1999 Outback
Subaru Legacy 1999 Limited 30th Anniversary
Subaru Legacy 1999 L 30th Anniversary
Subaru Legacy 1999 Outback Limited
Subaru Legacy 1999 SUS 30th Anniversary
Subaru Legacy 2003 L SE
Subaru Legacy 2004 L 35th Anniversary
Subaru Legacy 2005 i
Subaru Legacy 2005 Limited
Subaru Outback 2000-2005 Limited
Subaru Outback 2000-2004 Base
Subaru Outback 2001-2004 L.L. Bean
Subaru Outback 2001-2003 VDC
Subaru Outback 2002-2004 H6
Subaru Outback 2004 H6 VDC
Subaru Outback 2004 H6 35th Anniversary Edition
Subaru Outback 2005 R
Subaru Outback 2005 i
Subaru Outback 2005 VDC Limited
Subaru Outback 2005 R L.L. Bean Edition
Subaru Outback 2005 XT
Subaru Outback 2005 XT Limited
Subaru WRX 2014-2021 Base
Subaru WRX 2014-2021 Limited
Subaru WRX 2014 SE
Subaru WRX 2014-2016 STI
Subaru WRX 2015-2021 Premium
Subaru WRX 2017-2021 Sport-tech
Subaru WRX 2017-2021 Sport
Subaru WRX 2018-2021 CVT
Subaru WRX 2018-2021 6 Man
Subaru WRX 2019-2020 Sport-tech RS
Subaru WRX 2019 Raui Edition
Subaru WRX 2021 EyeSight
Subaru WRX STI 2014 Tsurugi Edition
Subaru WRX STI 2014-2021 Base
Subaru WRX STI 2014, 2017-2021 Sport-tech
Subaru WRX STI 2015 Launch Edition
Subaru WRX STI 2015-2021 Limited
Subaru WRX STI 2016 Series.HyperBlue
Subaru WRX STI 2017-2021 Sport
Subaru WRX STI 2018 Type RA
Subaru WRX STI 2018-2021 STI
Subaru WRX STI 2019 S209
Subaru WRX STI 2020 Kanrai Edition

Killer B Banner

Who is Killer B?

Killer B is an aftermarket company based in Waynesboro Virginia. They are known for producing parts and accessories for the automotive industry, specifically, Subaru made vehicles. The company started out in a small garage equipped with only a handful of tools, passion and enthusiasm for cars. Today, they are one of the go-to Subaru experts in the market.

Hands-On Company

The company has involved itself with various racing teams and ordinary daily drivers to understand what their customers want. By getting information directly from them, they are able to produce parts that satisfy their actual needs. Over the years, they were able to perfect their craft and become experts when it comes to the Subarus.

Quality Products

All of their products are done in-house, from design to actual manufacturing and fabrication. This allows them to have full control over their quality. and at the same time, ensure that their products come out the way they would like it to be. Designed by enthusiasts for fellow enthusiasts, you can be sure that you will only be getting the best value for your money.

Purchase Killer B Products At Vivid Racing

If you own a Subaru and are in the market for high-quality performance parts and accessories for your vehicle, then Killer B is the brand for you. Dealing with Subaru’s, they understand what it takes to improve your vehicle’s visual look and performance. To know more about Killer B, visit Vivid Racing and check out their list of products that fit your specific requirement.





All Killer B Motorsport parts have a Lifetime Warranty for the Original Purchaser. This warranty only applies to the original purchaser and is non-transferable. If the product fails it would need to be determined by Killer B Motorsport that it is due to manufacturing defects in materials or workmanship. This does not cover normal wear and tear. Improper use, modification, or abuse voids this warranty. Killer B Motorsport will not be held responsible for additional costs due to the failure of a product (cost of sale, towing, labor, etc.).

Warranty claims must be shipped back to Killer B Motorsport for review. You must call or email for return authorization prior to returning the product. For warranty evaluation please return your item to Killer B Motorsport Warranty, 1 Solution Way, Suite 201, Waynesboro, VA 22980.

Warranty claims will not be honored if the product was not purchase through an approved dealer.

Killer B Motorsport does not Warranty Wrapped Headers.

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