EFR 6258


The EFR 6258 is the smallest turbocharger in the ultra-efficient EFR lineup. The 62mm OD compressor has a 49.6mm inducerat 44lb/min max flow – supporting up to 440hp with very large map width for outstanding power potential even at high boost.

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The 6258 is the fastest spooling EFR turbo – and fits in a small package. Ideal for small engines in single turbo configuration and stock internal or modified engines. This is an excellent turbocharger for autocross, rally, drift, road racing and street driven applications. The low inertia 58mm Gamma-Ti turbine wheel is optimally matched for maximum response and fastest spool with the FMW compressor wheel. EFR 6258 uses the smallest-sized EFR compressor housing, fitting in the tightest engine bays particularly twin turbo V6 applications. Ideal for use in single turbo applications for the 260-440hp range, or as twin turbo applications 400-700+hp.

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 type: Low Inertia Gamma-Ti Turbine Wheel
Turbine Wheel OD: 58mm (recommended) OR 55mm
Stainless Steel Investment Cast Housing
0.64 A/R T25 Housing (Internal WG)
0.80 A/R T4 Twin Scroll Housing (Internal WG)
Turbine outlet: GT-Vband (aka small 3″ vband) ~92mm OD for all EFR turbos

Additional information

Weight 6 lbs
Dimensions 15 × 15 × 15 in
Turbine Housing

None, T25 .64 A/R Housing IWG, T4 Twin Scroll IWG



Borgwarner Turbos EFR & Airwerks