Killer B 08-14 WRX / 08-17 STI Air/Oil Separator w/ Plumbing

SKU: GR-MV3S-C

Killer B Motorsport Air/Oil Separator w/ Plumbing Subaru WRX & STI Performance

The Killer B Motorsport Air/Oil Separator w/ Plumbing (SKU: GR-MV3S-C), the unrivaled leader in air/oil separation technology. Engineered with precision and rigorously tested for superior performance, this AOS stands head and shoulders above all competitors, delivering unmatched efficiency, durability, and ease of maintenance. Designed specifically for high-performance Subaru WRX and STI models, this system is the definitive choice for enthusiasts who demand the best for their vehicle.

Why Choose the Killer B Air/Oil Separator?

The Killer B AOS is not just another aftermarket part—it’s a game-changer. Unlike other air/oil separators or catch cans that rely on restrictive media or baffles, the Killer B system uses a cutting-edge centrifugal filtration process to remove oil in both liquid and vapor forms from crankcase gases. This ensures cleaner intake air, improved ring seal, reduced oil consumption, and enhanced power potential. Its unrestricted design maximizes crankcase evacuation, making it the top-performing solution for daily drivers, track warriors, and high-horsepower builds exceeding 700whp. No other AOS matches its ability to handle extreme conditions while maintaining engine efficiency and reliability.

Crafted in the USA from billet 6061-T6 aluminum and TIG-welded for durability, the Killer B AOS is built to last, backed by a Lifetime Warranty. Its sleek design not only performs flawlessly but also adds a stunning visual upgrade to your engine bay, earning praise from Subaru enthusiasts for its flawless fitment and gorgeous finish. With no media to clean or replace and a drain-back system that returns collected oil to the crankcase, maintenance is effortless, saving you time and hassle compared to inferior alternatives.

Performance Advantages Over Competitors

• Superior Oil Separation: The centrifugal filtration system outperforms traditional baffled or media-based catch cans by efficiently capturing oil droplets of varying sizes under diverse pressure and velocity conditions.
• Enhanced Engine Efficiency: By applying vacuum to the crankcase via the turbo inlet, it improves ring seal, reduces oil consumption, and boosts power potential—benefits not consistently achieved by other systems.
• Unrestricted Flow: Unlike competitors that compromise crankcase ventilation with restrictive designs, the Killer B AOS ensures optimal flow, critical for high-performance engines.
• Proven Across Applications: Extensively tested on stock engines, daily drivers, autocross, drag racing, and builds exceeding 700whp, ensuring reliability in any scenario.
• No Unnecessary Complexity: Eliminates the need for heating or cooling systems, reducing weight, installation time, and potential leak points, unlike some overly complicated alternatives.

What’s Included in the Purchase

The Killer B Air/Oil Separator w/ Plumbing (SKU: GR-MV3S-C) is a complete kit designed for a seamless, bolt-on installation. The package includes:

• Air/Oil Separator Unit: Billet 6061-T6 aluminum, TIG-welded, with six stainless steel bolts for easy inspection and cleaning.
• Complete Plumbing Kit: Motorsport-grade hoses and Killer B Motorsport push-lock barb fittings (no hose clamps required).
• Mounting Bracket and Hardware: All necessary brackets, stainless steel bolts, and fittings for a secure and precise installation.
• Installation Instructions: Detailed guide for a straightforward setup, though professional installation is recommended for optimal results.

Vehicle Fitment

• Year: 2008-2014 (Subaru WRX), 2008-2017 (Subaru STI)
• Make: Subaru
• Model:
  • WRX (2008-2014, GR chassis, Hatchback & Sedan)
  • STI (2008-2017, GR chassis, Hatchback & Sedan)
• Part Number: GR-MV3S-C

Note: Designed for left-hand drive (LHD) vehicles. Right-hand drive (RHD) applications may require custom fabrication for mounting and additional hoses/fittings.

Why This AOS is the Best Choice

The Killer B Air/Oil Separator is the culmination of years of research, engineering, and real-world testing across a wide range of Subaru engines and driving conditions. Its innovative design, premium materials, and flawless performance make it the go-to choice for Subaru owners who refuse to compromise. Whether you’re pushing your WRX or STI to the limit on the track or maintaining peak performance on the street, this AOS delivers unmatched protection and power. Don’t settle for less—choose the Killer B Air/Oil Separator for the ultimate in engine efficiency and reliability.