Click to zoom in
SKU: WPHV2
Killer B V2 High Flow Water Pump Housing EJ Series for Subaru Performance
The Killer B V2 High Flow Water Pump Housing (SKU: WPHV2), the definitive choice for enthusiasts seeking superior engine reliability and efficiency. Engineered with cutting-edge technology and precision craftsmanship, this water pump housing outperforms all competitors, delivering maximum coolant flow with minimal turbulence for optimal engine cooling. Whether you’re pushing your Subaru WRX, STI, Forester XT, Legacy GT, or Outback XT to its limits on the track or street, the Killer B V2 is the best choice for maintaining peak performance and preventing overheating.
Why Killer B?
The Killer B V2 High Flow Water Pump Housing stands head and shoulders above stock and aftermarket alternatives. Designed specifically for Subaru EJ Series engines (EJ20/EJ25), this housing is crafted using state-of-the-art 3D CAD software to ensure unparalleled flow efficiency and durability. Unlike OEM housings, which can restrict coolant flow and lead to higher engine temperatures, the Killer B V2 features a larger internal diameter and smooth taper inlet for turbulence-free flow, resulting in better heat dissipation and improved engine longevity. Its robust construction and meticulous engineering make it the top choice for high-RPM applications and demanding driving conditions.
Performance Advantages:
- Enhanced Coolant Flow: Optimized design increases coolant circulation, reducing engine temperatures and improving performance under stress.
- Superior Build Quality: Made from 304 stainless steel (or cast aluminum in select versions), ensuring corrosion resistance and long-term durability.
- Precision Engineering: CNC-machined flange and hand TIG-welded construction guarantee a leak-free install and perfect fitment.
- Turbulence-Free Design: Smooth transitions and roll-formed bead ensure secure hose connections and consistent flow.
- Proven Results: Users report noticeably improved coolant flow and lower temperature readings, especially when paired with upgrades like Koyo radiators.
Included:
- 1 x Killer B V2 High Flow Water Pump Housing: Precision-engineered for EJ Series engines, available in raw stainless steel or black powder coat finish (SKU: WPHV2-B for black).
- Optional Installation Kit (sold separately): Includes hose, clamps, and gaskets for a hassle-free install.
- Fitment Compatibility: Designed to work with OEM-size lower radiator hoses and OEM thermostat gaskets for seamless integration.
Note: For optimal performance, we recommend replacing the thermostat and gasket with OEM products during installation. Blue coolant is advised for EJ Series engines.
Vehicle Fitment
The Killer B V2 High Flow Water Pump Housing is compatible with the following Subaru models equipped with EJ20/EJ25 engines:
- 2002-2014 Subaru WRX
- 2004-2021 Subaru STI
- 2004-2013 Subaru Forester XT
- 2005-2009 Subaru Legacy GT
- 2004-2009 Subaru Outback XT
- 2004-2006 Subaru Baja Turbo
Part Numbers:
- WPHV2: Raw stainless steel finish
- WPHV2-B: Black powder coat finish
Why Killer B V2 is the #1 Choice
Unlike other aftermarket water pump housings, the Killer B V2 combines innovative design, premium materials, and Subaru-specific engineering to deliver unmatched cooling performance. Its larger internal diameter and smooth flow paths outperform OEM and competing products, providing peace of mind for high-performance builds. Ease of installation (rated 2/10 difficulty) and noticeable improvements in coolant flow and temperature management, making it a must-have upgrade for any serious Subaru enthusiast.
Installation Notes
- Bolt-On Simplicity: The WPHV2 bolts directly to your EJ Series engine with no modifications required.
- Lower Radiator Hose Fitment: May require trimming for perfect fitment, though it’s compatible with OEM-size hoses.
Cooling
Cooling system parts and accessories for HEMI, Hellcat, Trackhawk, Duramax, Cummins, and import performance builds are stocked at Black Ops Auto Works. Shop radiators, thermostats, thermostat housings, water pumps, coolant reservoirs, expansion tanks, radiator hoses, oil coolers, transmission coolers, fans and shrouds, and thermal wrap for street, track, towing, and diesel platforms. Every product is filterable by year, make, model, trim, engine, and drivetrain so the correct part ships the first time. Black Ops Auto Works carries 2116 Cooling SKUs across radiator, thermostat, water pump, hose, and heat management categories. What This Category Covers The Cooling category groups together every part that keeps engine, transmission, and charge air temperatures in check under real driving load. Coverage spans aluminum performance radiators, billet thermostat housings, high flow water pumps, silicone radiator hose kits, coolant reservoirs and expansion tanks, oil and transmission co...
View Cooling Products
Engine
Engine parts and engine bay upgrades for Dodge, Jeep, RAM, Chrysler, Chevrolet, Ford, Toyota, Nissan, Subaru, and Honda vehicles are stocked at Black Ops Auto Works. Shop oil catch cans, supercharger pulleys, thermostats, radiators, cooling parts, throttle bodies, intake manifolds, headers, ignition coils, spark plugs, sensors, gaskets, fuel pumps, valve covers, engine covers, billet cap covers, and full engine bay dress-up parts for HEMI, Hellcat, Trackhawk, Redeye, Demon, Scat Pack, RAM TRX, LS, LT, Coyote, EcoBoost, K-Series, and 2JZ builds. Every product is filterable by year, make, model, trim, engine, and drivetrain so the correct part ships the first time. Black Ops Auto Works carries 14,298 engine SKUs across performance, cooling, oil control, ignition, and appearance categories. What This Category Covers The Engine collection combines OEM-replacement engine service parts with performance aftermarket upgrades for supercharged, turbocharged, and naturally aspirated builds...
View Engine Products
Water Pumps
OE replacement and performance water pumps are stocked at Black Ops Auto Works for Silverado, F 150, Ram, Mustang, LS, Coyote, Subaru, Nissan and import engine builds. Shop mechanical water pumps, electric water pumps, pump housings, coolant circulation, replacement gaskets, timing service, accessory drive service, cooling upgrades, high flow components and engine reliability for focused maintenance, restoration and performance builds. Every product is filterable by year, make, model, trim, engine and drivetrain so the correct part ships the first time. Black Ops Auto Works carries 34 water pump SKUs across vehicle specific applications, replacement parts and performance upgrades. What This Collection Covers Fitment focused selection Water pumps circulate coolant through the engine, radiator and heater circuit. This collection includes OE style mechanical pumps, electric pumps and performance housings for domestic trucks, muscle cars and popular import platforms. OE Replacement ...
View Water Pumps Products