BorgWarner Cartridge S300SX-E EFR 66mm (91/80)

What you get with this BorgWarner S300SX-E EFR turbo cartridge is a complete, self-contained unit ready for installation into a compatible turbocharger housing. This isn't just a collection of parts; it's a precision-balanced rotating assembly, including the compressor wheel, turbine wheel, and shaft, all pre-assembled and ready to go. This cartridge is designed for enthusiasts looking to build or upgrade a turbo system for significant power gains, often seen in performance street cars or dedicated race applications where reliability and consistent performance are key.

The S300SX-E EFR series from BorgWarner is known for its robust construction and advanced features. This particular cartridge features a 66mm compressor wheel, which offers a good balance between airflow capacity and responsiveness for many applications. The turbine side is a 91/80 designation, indicating the inducer diameter and A/R ratio, which helps dictate exhaust gas flow and spool characteristics. The EFR (Engineered for Racing) line incorporates features like a forged-billet compressor wheel for improved durability and reduced weight, and a high-flow turbine housing design to help the turbo breathe easier. The internal wastegate actuator is also a notable feature, simplifying installation and control for many setups.

When building a custom turbo system, using a high-quality cartridge like this BorgWarner unit is crucial. It simplifies the assembly process significantly, as the critical rotating components are already balanced and ready. You'll need to ensure you have the correct BorgWarner turbocharger housing that matches this cartridge, along with all the necessary plumbing, oil and coolant lines, and supporting modifications for your engine. This cartridge represents a solid foundation for a high-performance forced induction setup.