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Killer B Motorsport 4-1 Holy Header (Part Number: )
Killer B Motorsport 4-1 Holy Header (Part Number: )
Killer B Motorsport 4-1 Holy Header (Part Number: )
Killer B Motorsport 4-1 Holy Header (Part Number: )
Killer B Motorsport 4-1 Holy Header (Part Number: )
Killer B Motorsport 4-1 Holy Header (Part Number: )
Killer B Motorsport 4-1 Holy Header (Part Number: )
Killer B Motorsport 4-1 Holy Header (Part Number: )
Killer B Motorsport 4-1 Holy Header (Part Number: )
Killer B Motorsport 4-1 Holy Header (Part Number: )
Community Media
Killer B Motorsport 4-1 Holy Header (Part Number: )
Killer B Motorsport 4-1 Holy Header (Part Number: )
Killer B Motorsport 4-1 Holy Header
Subaru Models w/ EWG (inc. 2002-2014 WRX / 2004+ STI)
Read 3 Reviews | 17 Q&As
Part # HH-EWG
$2,086.00
msrp: $2,086.00

In stock! Ships same day

Features & Product Details

RallySport Direct proudly carries a great selection of quality performance upgrades and accessories brought to you by the metal masters at Killer B Motorsport. 

Here, you are looking at the Killer B Motorsport 4-1 Holy Header. This header was developed using state of the art CAD software & simulations to determine optimal design to increase power in the mid to high RPM range. Short as possible primaries with a single secondary significantly decrease header volume allowing exhaust gas pressure to build quickly. he 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 response and the ability to hold more power higher into the revs.


 

FEATURES:

 

  • 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, they use the largest bends possible at every location. It would be cheaper to use 2” bends everywhere as 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 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 secondary’s 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 or wrap the 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!
  • External Waste Gate 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.
  • Weighs only 17 pounds (vs. OEM weighs 25 pounds)
  • Works with OEM EJ25 Oil Pans, and Killer B Motorsport Performance Aluminum Oil Pan!
  • Made in the USA and Killer B quality!
     
  •  

    Note: May not fit some Forester, Outback, and Legacy models with the OEM oil pan and cooler.

    Specifications

    Brand: Killer B Motorsport
    Includes Catalytic Converter: No
    Installation Hardware Included: No
    Manifold Design: Equal Length
    Piping Coating: No
    Piping Flex Joint: No
    Piping Material: 321 Stainless Steel
    Up Pipe Configuration: External Wastegate
    External Wastegate Size: 38mm
    Mfgr. Warranty: Lifetime
    Condition: New Product
    Return Policy:

    RallySport Guarantee - 30 Days


    Items that are covered under the RallySport Guarantee offer a 30 day no questions asked return policy.

    RallySport Guarantee items may be returned within 30 days of the original invoice date and must include all the original parts and contents for a refund.

    The RallySport Guarantee does not apply to products that have been modified, damaged, misused or abused. All returns require an RMA (Return Merchandise Authorization) Number, and freight charges are strictly non-refundable. For more information regarding our freight refund policy, please refer to our return policy page found HERE.
    Standard

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    REVIEWS & CUSTOMER MEDIA

    3 Reviews
    4 out of 5 Stars
    5 Stars
    (2)
    4 Stars
    (0)
    3 Stars
    (0)
    2 Stars
    (1)
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    Customer Photos and Videos
    Killer B Motorsport 4-1 Holy Header ( Part Number: HH-EWG)
    Killer B Motorsport 4-1 Holy Header ( Part Number: HH-EWG)
    Beautiful headers, rally car sound 2 years ago
    5out of 5stars

    Best headers on the market, they look amazing and personally love the sound. Much quieter at idle/cruising which is a wife-saver, but they really rip when you open it up. Feels much smoother between gear shifts than the stock headers did. 2011 WRX with a built engine, dom 1.5 10cm 92 oct making 392whp at 20psi (on a dyno-dynamics roller).
      
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    Killer B EWG 3 years ago
    5out of 5stars

    These headers are beautiful. Great packaging from RSD to ensure safe delivery.
      
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    10 of 10 people found the following review helpful
    Up pipe failed  4 years ago
    2out of 5stars

    Ordered and installed the holy header under a year ago, everything was great until about 3 weeks ago when I noticed something was a miss with the car. Spent every weekend trying to diagnose the issue until I finally made my way to the uppipe. Needless to say a huge crack in the pipe at the EWG pipe weld location will cause a major issue. Contacted Krystal at killer b, and she seems less than happy to talk to me about this issue but said they will repair it and send it back. Dont know how i feel about that. Maybe when they fix their email server and look at these pics they will change their mind.
      
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    QUESTIONS & ANSWERS

    • Q: What is the outlet size of the UpPipe  lowbee4 months ago

      What is the inside diameter of the outlet of this UpPipe ? I plan to port the inlet of the turbo so knowing UpPipe outlet ID is important. Thx
    • Q: What size and pitch exhaust studs do we use?  jtabarejo3 years ago

      Just received this the other week. The up pipe doesn't have studs with it. What size and pitch studs do I need to use to work with this up pipe? Something I thought would've come with it?
      • 0 of 0 people found the following answer helpful

        A:  OEM uppipe studs are used, either the Subaru OEM part number or Killer B's hardened uppipe studs are a great option.

        Brady R @ RallySport Direct 3 years ago  
          
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    • Q: Fittament  STxSTi3 years ago

      Would the up-pipe with the EWG fit with a Nameless Performance Catted Divorced Down Pipe on a 2015 STi?
    • Q: EGT Bung  MrBadguySan3 years ago

      Does the manifold or up-pipe come with an EGT bung, or will one have to be tapped in? If modification is required, is there a preferred position?
    • Q: Grimmspeed Up Pipe, Killer B Header, and Tial EWG   SubaruFiesta4 years ago

      Would the Grimmspeed V-Band Up Pipe and the Tial 38 mm EWG work with Killer B header?
      • 1 of 1 people found the following answer helpful

        A:  No. The G-S up-pipe uses a bolted flange connection where it mates to the manifold, not a v-band. Our EWG up-pipe is made to work with the Tial MV-S (38mm).

        [email protected] @ Killer B Motorsport 4 years ago  
          
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