SKU: 179140 | UPC: 840232700411
BorgWarner Super Core EFR B1 6258 Turbo Assembly
The BorgWarner Super Core EFR B1 6258 is the core assembly for the EFR 6258 turbocharger featuring dual ball bearings compressor and turbine wheels without housings. Build your turbo for vehicles like Subaru WRX STI Mitsubishi Lancer Evolution and other 4-cylinder performance cars targeting 225 to 600 horsepower. Pair with EFR housings for quick spool broad powerband and track-ready response.
Key Features
- Dual Ball Bearings: Ceramic hybrid bearings cut friction for spool up to 15000 RPM faster and last longer under 2+ bar boost
- Gamma-Ti Compressor Wheel: 62mm inducer 84mm exducer forged milled titanium flows 70+ lbs/min with 76% peak efficiency
- Inconel Turbine Wheel: 68mm inducer 58mm exducer withstands 1050C exhaust gas temps for reliable high horsepower
- Power Range: Handles 225-600 HP ideal for street track or drag setups with compressor map covering low to high boost
- Modular Super Core Design: Bolts into EFR 6258 housings with A/R options like 0.85 comp 0.64 or 0.85 T4 turbine
Product Notes
- Super core requires separate compressor and turbine housings for complete turbo
- Oil feed M12x1.25 coolant M14x1.5 ports match EFR standards
- Secure storage in dry environment to prevent corrosion on bearing surfaces
Installation Notes
- Professional installation recommended.
- Prime oil system and cycle bearings dry before full assembly
- Compatible with T4 open V-band turbine housings and 4″ or 5″ compressor inlets
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2004-2021 | Subaru | Impreza WRX STI | All |
| 2015-2021 | Subaru | WRX | All |
| 2008-2016 | Mitsubishi | Lancer | Evolution X |
| 1993-2020 | BMW | 3 Series | M3 E36 E46 E90 Turbo Builds |
| 2016-2021 | Honda | Civic | Type R FK8 |
| Universal | Various | 4-Cyl Turbo | Custom Builds |
Why Choose BorgWarner?
- Supplies turbos to Formula Drift NHRA champions
- Investment cast housings machined to micron tolerances
- Over 100 years engineering forced induction systems
Frequently Asked Questions
- Q: Will this super core fit my Subaru STI or Evo?
A: Yes with matching EFR 6258 housings it bolts into STI TD05 or Evo 4G63/4B11 flange conversions for direct or adapter fit - Q: What materials are used in construction?
A: Gamma-Ti compressor Inconel turbine 718 aluminum CHRA housing high-temp NiCrFe alloys throughout - Q: What warranty coverage applies?
A: 12-month unlimited mileage warranty from purchase date covers defects in materials workmanship with registration
Shipping & Handling
- Method: Standard ground
- Availability: In stock – ships same or next business day
- Packaging: Foam protected in double-wall box 13 x 13 x 13 inches
- Weight: 11.8 lbs
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