BorgWarner Turbine Housing EFR B2 74mm 1.05 T4 Twin Scroll

SKU: 12741019002 | UPC: 840232711349

BorgWarner Turbine Housing EFR B2 74mm 1.05 T4 Twin Scroll

BorgWarner EFR B2 turbine housing pairs with 74mm turbine wheels in EFR 7670 turbochargers for custom performance setups on inline-4 and inline-6 engines. Features T4 twin scroll inlet for fast spool and reduced lag paired with 1.05 A/R for strong mid-range torque and top-end power up to 850 hp. Ideal for drag racing street cars and track builds needing quick response and high exhaust flow.

Key Features

• Twin Scroll T4 Inlet: Divided pulses improve turbine efficiency cuts backpressure and accelerates spool by 300-500 RPM versus single scroll
• 1.05 A/R Ratio: Balances low-end response with high RPM flow supports 450-850 hp on 2.0-3.0L engines
• NiResist Material: Nickel-iron alloy endures 1050°C exhaust gas temperatures resists cracking for long-term reliability
• 4-inch V-Band Outlet: Clamp-style connection simplifies swaps and maintenance over welded flanges
• EFR 7670 Compatible: Precision cast for bolt-on fit to B2 center sections ensures zero leaks and peak boost control

Product Notes

• Matches EFR 7670 compressor and center housing part numbers 179258 179286 or equivalents
• Verify manifold T4 divided flange matches 2.5-inch outlets before ordering
• Standard ground shipping applies free over $99 on most orders

Installation Notes

• Professional installation recommended.
• Torque inlet studs to 28 Nm and V-band clamp to 15 Nm using anti-seize
• Requires T4 twin scroll manifold and 4-inch V-band clamp sold separately

This Part Fits

Year	Make	Model	Submodel
2004-2021	Subaru	Impreza	WRX STI
2003-2006	Mitsubishi	Lancer	Evolution VIII MR
2007-2015	Mitsubishi	Lancer	Evolution X GSR
1993-1998	Toyota	Supra	Twin Turbo
1989-2002	Nissan	Skyline	GT-R
2003-2009	Nissan	350Z	Track

Why Choose BorgWarner?

• Decades of OEM turbo leadership in rally and production cars
• Investment cast housings deliver consistent flow and heat management
• Backed by rigorous dyno testing for real-world power gains

Frequently Asked Questions

• Q: Will this housing fit my EFR 7670 turbocharger?
  A: Yes this is the OEM replacement turbine housing for all BorgWarner EFR 7670 B2 frame turbos with 74mm wheels
• Q: What material handles the heat best?
  A: NiResist iron alloy provides superior thermal stability and resists expansion under 1000+°C EGTs
• Q: Do I need special tools for install?
  A: Standard torque wrench and V-band pliers suffice uses common T4 bolt pattern professional tuning required post-install

Shipping & Handling

• Method: Standard Ground
• Availability: In stock – ships same or next business day
• Packaging: Original BorgWarner box 14 x 14 x 14 inches
• Weight: 11.5 lbs