BigBoost BMW Gen 1 B58 EFR Turbo Kit for F20 F21 F22 F23 F30 F31 F34 F32 F33 F36 and G01 (M140i, M240i, 340i, 440i, X3 M40i)
Looking for the ultimate BMW B58 turbo upgrade for your M140i, M240i, 340i or 440i? The BigBoost EFR Turbo Kit is a proven, high-performance solution for Gen 1 B58 and B58 TU 6-port engines. Built around the legendary BorgWarner EFR series, this kit delivers fast spool, massive top-end power and OEM-plus drivability. It is the go-to M140i turbo upgrade, M240i turbo upgrade, 340i turbo upgrade and 440i turbo kit for road, track and drag builds.
At Nforcd we have supplied and used BigBoost EFR kits and our customers love the response, reliability and repeatable performance. If you are chasing a dependable BMW B58 turbo upgrade that supports serious horsepower with high-quality hardware, this is it.
Why choose the BigBoost EFR Turbo Kit for your B58
- Genuine BorgWarner EFR performance with rapid spool and strong mid-range
- Cast twin-scroll manifold with 40 percent larger runners for improved flow and boost response
- Well-engineered, complete hardware package for a clean, durable installation
- Multiple EFR sizes to match your power goals while keeping street manners
- Perfect for BMW M140i, M240i, 340i, 440i and X3 M40i B58 Gen 1 and B58 TU 6-port
Power options
- EFR 8374: up to around 650 whp
- EFR 8474 or 9174: up to around 750 whp
- EFR 9280: up to around 900 to 1000 whp
Actual results depend on supporting mods, fuel and calibration.
What’s included
- BorgWarner EFR 8374, 8474, 9174 or 9280 turbocharger
- Cast twin-scroll manifold with 40 percent larger runners and external wastegate port
- Aviation-grade stainless steel oil feed lines
- Oil feed and return fittings for turbo
- Oil feed fittings for engine
- Oil drain adapter
- Lower boost pipe
- 4 inch aluminium inlet pipe
- Silicone couplers
- Smart Seal stainless steel hose clamps
- Turbo coolant inlet and outlet banjo fittings
- Engraved heat shield
- VPE V-band clamp
- Exhaust manifold gasket
- OEM O-ring kit
- Aeroquip coolant hose kit
- EWG mounting bracket
- EWG linkage kit
Compatibility
BMW B58 Gen 1 and B58 TU 6-port models including:
- 1 Series F20 LCI and F21 LCI: M140i and M140i xDrive
- 2 Series F22 and F22 LCI, F23 and F23 LCI: M240i and M240i xDrive
- 3 Series F30 LCI, F31 LCI, F34 GT LCI: 340i and 340i xDrive
- 4 Series F32 and F32 LCI, F33 and F33 LCI, F36 Gran Coupé and F36 LCI: 440i and 440i xDrive
- X3 G01: X3 M40i
Notes and tuning
- Custom tuning is required. This kit is widely supported on MHD and Bootmod3 (BM3).
- Professional installation recommended.
Fitting at Nforcd
We offer professional fitting at Nforcd in Warwickshire. For an installation quote or to discuss your build, email Sales@nforcd.com.
Part numbers
- BIGBOOST-EFR-8374
- BIGBOOST-EFR-8474
- BIGBOOST-EFR-9174
- BIGBOOST-EFR-9280
Manufactured by
BigBoost
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