BMW S55 Bank 2 Rear Turbocharger/Turbo (Cyl 4–6) OEM Genuine Direct-Fit Replacement Turbo Unit/Assembly for F80 M3, F82/F83 M4 & F87 M2 Competition | OE Part 11657849651

BMW S55 Bank 2 Turbo Unit for Cylinders 4–6 | F80 M3, F82 F83 M4, F87 M2 Competition | Part No. 11657849651

Bring your M car back to full punch with this original BMW turbo unit for the S55 engine, serving cylinders 4–6. If you are chasing lost power, boost oscillation, wastegate chatter, hesitation, limp-home mode or general underboost faults, replacing the tired rear-bank charger is the proven route to restore sharp response and factory-accurate performance. This is the correct dealer-supplied assembly for the S55 twin-turbo layout used in the F80 M3, F82 F83 M4 and F87 M2 Competition.

Built to BMW specifications and supplied as the current dealer part, this unit installs as a straight swap with no fabrication. We have installed these S55 chargers in-house and customers consistently report smoother spool, stronger midrange and dependable boost control after fitment.

Key reasons to choose this S55 Bank 2 turbo unit

• Correct part for the rear bank on the S55 engine layout serving cylinders 4–6
• Direct swap with original hardware positions, lines and heat shielding
• Addresses rattle from the actuator linkage, boost fade and intermittent fault codes
• Ideal for stock or mapped S55 cars that need reliable, factory-spec airflow
• Supplied as the latest BMW dealer part for long-term dependability
• Part number: 11657849651

Note: The S55 uses two turbo units. For a complete refresh, pair this Bank 2 unit with the matching Bank 1 charger for cylinders 1–3, available separately.

Recommended install consumables

To ensure a trouble-free job and protect your investment, we suggest renewing the following at the same time:

• Turbo fitting kit including gaskets, studs, nuts and sealing rings
• Coolant feed and return lines for the S55 twin setup
• Fresh engine oil and filter after priming the new unit
• BMW-approved coolant and de-ionised water mix

Professional installation

Prefer expert fitting? Book with MJ Modifications in Warwickshire. We install S55 turbo units daily and can supply all required fittings and fluids. Request a quote by emailing info@mjmodifications.co.uk.

Vehicle compatibility

• BMW M Series F80 M3 Saloon S55 (2012–2015)
• BMW M Series F80 LCI M3 Saloon S55 (2015–2018)
• BMW M Series F82 M4 Coupe S55 (2013–2017)
• BMW M Series F82 M4 GTS Coupe S55 (2013–2017)
• BMW M Series F82 LCI M4 Coupe S55 (2016–2019)
• BMW M Series F82 LCI M4 CS Coupe S55 (2016–2019)
• BMW M Series F83 M4 Convertible S55 (2013–2017)
• BMW M Series F83 LCI M4 Convertible S55 (2016–2019)
• BMW M Series F87 LCI M2 Competition S55 (2018+)

Fitment check

We verify compatibility before dispatch. Add your UK registration or the last 7 characters of your VIN at checkout so we can confirm suitability for your car.

Part number

11657849651

Manufacturer and warranty

Manufactured by BMW. Warranty: two years for UK customers and one year for international customers when a compatible VIN is supplied at checkout.

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