Killer B Motorsport
Killer B Equal Length 4-1 Holy Header EJ Series
NOT LEGAL FOR SALE OR USE IN CALIFORNIA ON ANY EMISSION CONTROLLED MOTOR VEHICLE.
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. ONLY on Traditional and EWG
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!
This Part Fits:
|2008||Subaru||Forester||Sports 2.5 XT|
|2007,2011-2014||Subaru||Impreza||WRX STI Limited|
|2010||Subaru||Impreza||WRX STI Special Edition|
|2015||Subaru||WRX STI||Launch Edition|
Shipping & Returns
Shipping & Returns
In most cases orders are processed same day or the next business day. Most orders take about 1-3 business days to ship.
Please note that all orders are processed and shipped Monday-Friday 10a-6p PST excluding weekends and holidays.
Any orders placed after 4p PST for items that are in stock will be shipped the next business day
Returns and exchanges are only offered on eligible items, excluding final sale and special ordered items.
All returns/exchange inquiries must be made within 14 days after receipt of order. Any inquiries after the 14 day period will not be honored. Please contact our sales staff for any return/exchange inquiries, and we will be more than happy to assist you!
Any returns received without an RMA (Return Merchandise Authorization) number will be automatically declined, and the customer will be responsible for shipping the order back to them.
Once you receive your RMA number, you will have 30 days to ship the item/order back to the respective location. If the item/order is not shipped within the 30 day period, the return will be declined, and the customer will be responsible for paying for shipping the item/order back to them.
Special Order & Final Sale
Special Order & Final Sale
All special order items are deemed as "made to order" - and therefore cannot be canceled, returned, exchanged, or refunded for any reason. The same policy applies to final sale items. These are non-negotiable terms, so please keep this in mind before checking out. If you have any questions regarding these terms, please feel free to read our policy for special order and final sale items, or contact one of our sales representatives for clarification!