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BorgWarner EFR 6258 Turbo

SKU EFR-6258

BorgWarner EFR 6258 is the Smallest and Fastest Spooling EFR Turbo

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BorgWarner EFR 6258 is the Smallest and Fastest Spooling EFR Turbo

BorgWarner EFR 6258 is the smallest and fastest spooling EFR turbocharger

The EFR 6258 is the smallest and fastest spooling EFR turbocharger in the lineup. Ideal for small engines in single OR twin turbo configuration, this is an excellent turbocharger for autocross, rally, drift, road racing and street driven applications. A direct plug-n-play for SR20DET, its also popular for Mazda Miata, Subaru WRX and small displacement UTV (RZR, X3) and Snowmobile or Jetski applications.

The 62mm OD compressor has a 49.6mm inducer rated at 44lb/min max flow – supporting up to 440hp. This compressor wheel is versatile with very large map width for outstanding power potential, even at high boost. The low inertia 58mm Gamma-Ti turbine wheel is optimally matched for maximum response and fast spool with the FMW compressor wheel. EFR 6258 uses the smallest-sized EFR compressor housing, making fitment in the tightest engine bays possible. Ideal for use in single turbo applications for the 260-440hp range, or as twin turbo applications 500-800+hp.  Ceramic Ball Bearing only, watercooling recommended but not mandatory.

Compressor Specifications

    • Compressor Type: Forged-Milled Wheel (FMW) Extended Tip
    • Compressor Wheel OD (exducer): 62mm
    • Compressor Wheel Inducer: 49.6mm
    • Max Flow Rate: 44 lb/min
    • Built-in BOV: All EFR compressor housings incorporate an integrated BOV.
    • Compressor Housing: 2.5″ inlet, 2.0″ hose coupler outlet.

Turbine Specifications

    • Turbine Wheel Material: Low Inertia Gamma-Ti Turbine Wheel
    • Turbine Wheel OD: 58mm (recommended) OR 55mm
    • Turbine Housing Material: Stainless Steel Sand Cast Housing
    • Turbine outlet: GT-Vband (aka small 3″ vband) ~92mm OD for all EFR turbos


(Supercore PN 179140 or .64 A/R Turbo PN 179150)


Why We Love the EFR 6258:

The smallest EFR turbo in the lineup, the 6258 packs a lot of fun in a small package.  Used on a variety of applications from Mazda Miatas to Subaru EJ25, if early spool and 250-400hp are the goal, this turbo is absolutely phenomenal.  It also works well for twin turbo applications in the 500-800hp range for unreal performance on 3.5L ecoboost, RB26 and 2JZ applications  



    • Dual Row Ceramic Ball Bearings – lowest friction and fastest spool/response, most extreme durability, built-in 2mm oil restrictor
    • Watercooled Center Section – watercooling is recommended, 14mm banjo bolts
    • Double seals on both turbine and compressor end for extreme durability and resistance to any oil seepage
    • Boost Control Solenoid Valve Integrated to Compressor Housing
    • Integrated Speed Sensor mounting provisions
    • Optional Turbo Speed Sensor Kit
    • Optional Turbo Speed Gauge

0.64 A/R T25 (Internal WG)

Optional 2000 Degree Coating








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