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Killer B Motorsport 4-1 Holy Header ( Part Number:KIL HH4-1)

Killer B Motorsport 4-1 Holy Header - Subaru Models (inc. 2002-2014 WRX / 2004+ STI)

MODEL # KIL HH4-1
Manufacturer Part # HH4-1

$1,645.00

24
hours
In stock! Ships same day
Qualifies for free shipping!


Description

The Killer B Motorsport Holy 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. 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 include:
· 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, 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 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!
· 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!

May require slight modifications to the stock oil cooler for 06-07 WRX and Forester XT models. Some models may require modification to the stock fan shroud.
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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

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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4.6

5 STAR
62%
4 STAR
37%
3 STAR
2 STAR
1 STAR

Good quality header, 2017 install is a bit different.
cornwrx 2 years ago
Fitment wasn't spot on from the up-pipe -> header. The piece between the up-pipe and the header (Where the V-Band is) itself was off by about 1/2 an inch. After some prying, everything went smooth. Also on the 2017 models, there is another bracket on the stock up-pipe so you need to push this upwards and down towards the downpipe. (Assuming you're on a lift). Also, you should buy new studs for this up-pipe, we managed to reuse the old ones off the stock up-pipe, but it wasn't easy getting them off. All in all, not a bad purchase. Great quality, but the install on the 2017 is a bit different than the 2015's.
Comment

install
Heichel84 3 years ago
I have a 2015 sti with 4k miles thought I could use the original studs. Double nut method or applying heat would not get them out of the old up pipe so best to get new studs. Definitely worth the money though
Comment

install
Heichel84 3 years ago
I have a 2015 sti with 4k miles thought I could use the original studs. Double nut method or applying heat would not get them out of the old up pipe so best to get new studs. Definitely worth the money though
Comment

An excellent addition, even as a daily drive
Demonik 3 years ago
Got this two months back. An excellent addition to the car. The torque and throttle response is amazing. My car is a stage 2 with a Milltek turbo back and the car sounds amazing. If you would like to hear it, the clip is below http://youtu.be/1DUJjmWZHIs I am giving it 4 stars because the Greddy Oil Sandwich Adapter GRE 12002801, does not clear the headers. So I had to remove it and I am running without a oil temperature reading at the moment. :(
Comment

Functional art
washoepitbulls06123 4 years ago
2013 wrx process west intercooler/ aem intake/ cobb catted downpipe car lives at 4600 ft / 5000ft elevation pro tuned 248 hp 248 tq on the worst fuel in the country ACN 91 . After install of coated header and a deatschworks 65C pump on stock injectors and retune 263 hp/ 278 Tq on 16 psi of boost injector duty cycle 81%. Better spool and throttle response
Comment

  • Q: 2014 Subaru WRX  paulanthony 7 months ago

    Answer

    What size is the v-band on the up-pipe? Also, do you guys sell the Header without the v band up-pipe?


    • A: The V Band size is 2 inches and is part number VBF2, we do not have it on our site so give us a call if you need to order it. We do sell the header without an uppipe that will be compatible for any 2 bolt uppipe, it is part number KIL HH-2BOLT.


      Tyler G. 7 months ago
  • Q: 05 Subaru legacy gt  Xxeonxx92 7 months ago

    Answer

    Does the up pipe come with a place for the oem exhaust temperature sensor?


    • A: There is not an extra bung on the Killer B uppipe for an extra sensor. Only Subarus with a catted uppipe will see this extra sensor and normally its deleted because it mainly detecting the cats health.


      Evan M. 7 months ago
  • Q: V-Band   kingsleymorris06033 8 months ago

    Answer

    The revelation of V-Band sounds very good, but how reliable is it in rough driving conditions including the occasional dirty road hard driving? I know you have the 2 bolt up-pipe option so which would be better under such conditions?


    • A: We haven't had any issues come back to us when customers have purchased this product recently. The two bolt option was created so that people with a 2 bolt up pipe EWG could run the headers as well. Personally I wouldn't mind either one but we haven't had any issues with them.


      Tyler A. 8 months ago
  • Q: Sound  Boxer_WRX 2 years ago

    Answer

    Will this header keep the amazing rumble sound ?


    • A: This is an equal length header. It will not retain the Subaru rumble, but still sounds great.


      Josh P. 2 years ago
  • Q: Tune  SubieLover04 2 years ago

    Answer

    When installing these headers is a tune required? If so what would the damages be if you do not get one?


    • A: You can run the header without a tune, but you would not see any power gains without a custom tune.


      Josh P. 2 years ago
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