CTS Turbo Stage 2+ S55 Twin Turbocharger Upgrade BMW F87 M2 Competition, F80 M3, F82/F83 M4 Bolt-On, Brand New, No Core, VSR Balanced, Silicone Inlets

Uprated twin turbo set for BMW M2 Competition, M3 and M4 with S55 engine

Ready to transform your S55-powered BMW with serious, dependable gains and factory-style fitment. This CTS Turbo Stage Two Plus upgrade delivers rapid spool, exceptional top-end and everyday drivability in a direct-fit package. Ideal for F87 M2C, F80 M3 and F82 F83 M4 owners who want a high-flow replacement that drops into the original location and works with standard-position downpipes, intake systems and charge pipes.

Developed using advanced transient flow analysis and confirmed on the flow bench, these twin scroll housings retain OE geometry while unlocking far greater airflow. With the correct supporting hardware and a built engine, this setup has achieved up to 808 whp, showing just how capable the S55 platform is with a properly engineered biturbo solution.

Each unit is completely new with upgraded internals. This is not a refurbished hybrid and there is no core exchange required. The kit includes large wire-reinforced silicone inlet hoses that hold their shape under vacuum and integrate with any stock-fit or aftermarket intake. Precision VSR balancing exceeds OE tolerances for smooth operation and long-term reliability at higher boost levels.

Why enthusiasts choose this S55 turbo upgrade

• Direct-fit replacement for M2C, M3 and M4 S55 applications, no cutting or fabrication
• Works with factory-position downpipes, intake hardware and charge pipes
• Brand-new units, no exchange surcharge and no core return
• Higher mass flow at lower pressure ratios for strong, reliable gains
• VSR balanced for durability, smoothness and consistent performance
• Reinforced silicone inlet hoses included, compatible with OE or performance intakes
• Perfect for spirited road use, track days and drag setups when tuned correctly

Real-world results

With appropriate fuelling, cooling and a forged S55 build, customers have recorded 808 whp. The design prioritises efficiency and control to help avoid overspeeding, supporting reliable power delivery and repeatable results. Feedback from our own installs and our customers consistently praises the quick response, OEM-like fit and impressive pull to redline.

Boost guidance and tuning notes

Typical sweet spot is around 24 to 25 psi with roughly 85 to 88 percent WGDC, subject to your tuner’s strategy and fuel choice. Electronic wastegate actuators must be calibrated with ISTA+ prior to mapping. Installation and calibration should be completed by a qualified professional.

What you receive

• Pair of brand-new CTS Turbo Stage 2+ turbochargers
• Large wire-reinforced silicone inlet pipes
• Compatibility with factory mounting hardware and gaskets
• Reuse original electronic wastegate actuators and OE-position ancillaries

Technical highlights

• Completely new assemblies, no core exchange required
• Journal bearing CHRA with heavy-duty bearing set
• Increased turbine shaft diameter by 0.5 mm and thrust surface by 2 mm
• Billet 8-blade compressor wheel, 47.4 mm inducer, 58 mm exducer with 63.10 mm extended tip
• 9-blade Mar-M 246 superalloy turbine wheel, 52 mm inducer, 45.6 mm exducer, high-flow design
• 316 stainless steel turbine housings and wastegate components
• VSR balanced beyond OE specification
• Wire-reinforced silicone inlets included
• Compatible with factory installation hardware and OE wastegate actuators

Vehicle fitment

BMW S55 applications

• F87 LCI M2 Competition 2018 and up
• F80 M3 Saloon 2012 to 2015
• F80 LCI M3 Saloon 2015 to 2018
• F82 M4 Coupe 2013 to 2017
• F82 M4 GTS 2013 to 2017
• F82 LCI M4 Coupe 2016 to 2019
• F82 LCI M4 CS 2016 to 2019
• F83 M4 Convertible 2013 to 2017
• F83 LCI M4 Convertible 2016 to 2019

Fitting and calibration

For supply, installation and custom ECU calibration, speak to MJ Modifications in Warwickshire. We have installed these in-house and customers have been delighted with the drivability and performance. Request a fitting quote at info@mjmodifications.co.uk. Wastegate actuators must be calibrated in ISTA+ prior to mapping.

Compatibility check before dispatch

We verify fitment prior to shipping. Add your UK registration or the last 7 of your VIN at checkout and we will confirm suitability.

Part number

CTS-TR-0055

Brand and warranty

Manufacturer CTS Turbo

Warranty 1-year CTS Turbo warranty

Search-friendly terms

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Order with confidence In stock with fast UK dispatch. Speak to us if you are building a fast-road, track or drag package and want advice on supporting mods, fuelling, cooling and mapping strategy.