Looking for the absolute best turbo money can buy? Look no further; the EFR series are the very best turbos ever made, bar none! Borg-Warner pulled all the stops in designing the very best setup that technology could offer, and boy did they deliver! No turbo has better response, and no turbo of similar size makes more power.

We strongly recommend the 1.05 A/R Twin scroll T4 turbine housing. This 62.6mm turbo is designed to make 475-750 HP

EFR Tech page

Compressor Specifications

Compressor Type: Forged-Milled Wheel (FMW) Extended Tip
Compressor Wheel OD (exducer): 83mm
Compressor Wheel Inducer: 62.6mm
Max Flow Rate: 79 lb/min
Integrated Housing Accessories: All EFR compressor housings have an integrated BOV, boost control solenoid, and provisions for a compressor wheel speed sensor!

Compressor Housing Dimensions:

Inlet: 4" Ported Shroud Hose Coupler
Outlet: 2.5" Hose Coupler w/integrated V-band option

Turbine Specifications

Turbine Type: Low Inertia Titanium Turbine Wheel
Turbine Wheel OD: 74mm; Stainless Steel Cast Housing

The EFR 8374 is available in (3) different turbine housing configurations:

• 0.83 A/R T3 undivided (Internal WasteGate)
• 0.92 A/R T4 twin scroll (Internal WasteGate)
• 1.05 A/R T4 twin scroll (External WasteGate)

Turbine outlet: GT-V band (aka small 3" v-band) ~92mm OD for all EFR turbos

All EFRs feature:
• Gamma-Ti turbine wheel
• Dual ceramic ball bearing assembly with metal cage
• Forged milled extended tip compressor wheel
• Stainless steel turbine housing
• Water cooled bearing housing
• Large internal wastegate
• Compressor recirculation valve (a.k.a BOV)
• Boost control solenoid valve