BorgWarner 11589880036 EFR 6258-G Turbocharger T4 Twin Scroll 0.80 A/R

The BorgWarner EFR 6258-G is a high-performance turbocharger designed for enthusiasts seeking maximum response and power in a compact package. This complete turbocharger assembly features a T4 twin scroll turbine housing with 0.80 A/R ratio, making it ideal for single turbo applications producing 225-450 horsepower or twin turbo setups generating 400-700+ horsepower.

Key Features:

• Gamma-Ti (Titanium Aluminide) turbine wheel - exotic material reduces weight by approximately 50% compared to standard turbine wheels for dramatically improved response
• Forged Milled compressor Wheel (FMW) with Extended Tip Technology - 62mm outer diameter with 49mm inducer, rated at 44 lb/min max flow
• Dual ceramic ball bearing assembly with metal cage - provides lowest friction, fastest spool response, and extreme durability
• Integrated Compressor Recirculation Valve (CRV) - built-in bypass valve eliminates need for external BOV
• Boost Control Solenoid Valve (BCSV) included - electronic boost control valve integrated into compressor housing
• Aluminum bearing housing with watercooling provisions - watercooling recommended but not mandatory, uses 14mm banjo bolts
• T4 twin scroll flange with internal wastegate - large wastegate port handles high-performance flow requirements
• Speed sensor mounting provisions - allows connection of optional speed sensor for monitoring turbo shaft speed
• 58mm turbine wheel outer diameter paired with low-inertia design for optimal response and fastest spool

The EFR 6258 is the smallest and fastest spooling turbocharger in BorgWarner's ultra-efficient EFR lineup. Its compact B1 frame size fits in the tightest engine bays, making it particularly well-suited for twin turbo V6 applications. The compressor housing features a 2.5-inch inlet and 2.0-inch outlet with integrated recirculation valve. This turbocharger excels in autocross, rally, drift, road racing, and high-performance street applications where quick throttle response and reliable power delivery are critical. Built-in oil control orifice eliminates the need for external oil restrictors.