BMW B58 Gen 1 Hybrid Turbo Upgrade - FLOW MAX+ V2.5+ for M140i M240i 340i 440i - Stage 3 Big Turbo, Bolt-On Direct Fit, Fast Spool, 850+ HP, Uprated Aftermarket Performance, Stock Location Plug-and-Play, VSR Balanced, No Core Exchange, UK

FLOW MAX+ V2.5+ Hybrid Turbo for BMW B58 Gen 1

Looking to unleash serious performance without sacrificing day-to-day manners? This direct-fit uprated turbocharger is the B58 game changer. It delivers lightning-quick spool, a wide and relentless powerband to the limiter, and the headroom to support eight-hundred-plus horsepower builds, all while retaining stock-like drivability for commuting and long trips.

Purpose built for BMW B58 Gen 1 applications including M140i, M240i, 340i and 440i, this unit is a complete turbocharger assembly, not just a wheel swap. It is a proven favourite among UK and global tuners for fast response, strong midrange, and high-flow top end on street, strip and track.

Why enthusiasts choose this upgrade

• Rapid spool for instant throttle response and superb road manners
• Pulls hard to redline with rock-solid boost control
• Supports extreme power targets while remaining daily-friendly
• Direct bolt-on fitment for B58 Gen 1 platforms
• Outright purchase with no exchange required

Engineering highlights

• MAR-M superalloy turbine wheel rated beyond 1000°C for durability and flow
• High-flow turbine housing rated beyond 1000°C with stainless steel manifold
• FLOW MAX billet compressor wheel flowing 850 CFM
• Upgraded thrust assembly for reliability at elevated boost pressure
• Precision machine work and high-speed core balancing carried out in the USA
• 1 year limited warranty

Real-world performance

Independent customer cars are delivering serious results:

• 100 to 200 km/h in 4.7 s
• 60 to 130 mph in 5.50 s
• Watch the run

Balancing and quality control

• Low-speed balancing: View video
• Final high-speed VSR process: View video
• Machining overview: View video
• V2.5 machining overview: View post

Fitment

For BMW B58 Gen 1 engines only. Not suitable for B58 Gen 2 applications.

Unsure which version you have? Email the last 7 digits of your VIN and we will confirm compatibility: info@mjmodifications.co.uk

Installation and support

We have installed and used this B58 hybrid in-house at MJ Modifications and our customers have been thrilled with the stock-like response and huge top-end punch. For professional fitting in Warwickshire, request a quote at info@mjmodifications.co.uk.

What is included

A complete performance turbocharger designed for fast spool, big-power stability and everyday reliability. Outright purchase with no core exchange.

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