CTS Turbo turbocharger for BMW M2C/M2CS, M3/M4 S55

CTS Turbo Stage 2+, also known as “RS”, is a turbocharger upgrade kit developed specifically for the BMW S55 platform. It is based on experience from previous turbocharger projects and includes new technologies to optimise performance while retaining factory fitment.

Using analysis of transient flow and flow-bench measurements, the engineers optimised the turbine housing while retaining factory fitment, the factory mounting position and the use of the original wastegate actuators. The kit is therefore compatible with factory-fit downpipe kits, intake systems and charge pipes. A result of 808 whp was achieved on a built engine with supporting modifications. The original wastegate actuators, high-performance downpipe kits, intake system and charge pipes can be used during installation. No specially fabricated parts are required; the original mounting hardware and gaskets are used.

The kit includes two brand-new turbochargers and enlarged turbo inlet pipes, so no exchange cores are required.

Each turbocharger is dynamically balanced to the VSR standard, exceeding factory tolerances. It is equipped with upgraded heavy-duty bearings and thrust washers. Reinforced silicone inlet pipes compatible with all intake systems are included. They do not collapse or deform under vacuum.

The turbochargers are designed to flow a large volume of air at lower boost pressure. This makes it possible to achieve high power without overspeeding the turbochargers, helping to ensure reliable operation.

Optimal boost pressure is 24–25 psi at approximately 85–88% WGDC. The final values must be confirmed and adjusted by the tuner according to the specific engine configuration.

Features

• Two brand-new turbochargers; no exchange core required
• CHRA with journal bearings and direct fitment, heavy-duty bearings, a turbo shaft diameter increased by 0.5 mm and a thrust surface increased by 2 mm
• 8-blade milled compressor wheel, 47.4 mm inducer, 58 mm exducer and an extended 63.10 mm diameter tip
• 9-blade Mar-M 246 superalloy turbine wheel, 52 mm inducer, 45.6 mm exducer and high flow
• 316 stainless steel exhaust housings and wastegate components
• VSR balancing exceeding factory tolerances
• Reinforced silicone turbo inlet pipe with steel reinforcement included
• Compatible with the original mounting hardware, which is not included
• Compatible with the original wastegate actuators, which are not included; the original actuators are used

The kit is intended for BMW M2C/M2CS (F87), BMW M3 (F80) and BMW M4 (F82/F83) models with the S55 engine.

Parts required for installation

When installing the turbochargers, the engine oil, oil filter and coolant must be replaced.

• 2× 11657847039 – original exhaust manifold gasket
• 2× 11721437202 – exhaust nut
• 17× 11657851195 – M7 hex nut
• 2× 11617848448 – turbo outlet or charge pipe O-ring
• 2× 18307553601 – original gasket between the turbocharger and exhaust downpipe
• 2× 18307851168 – original gasket between the downpipe and the rear section of the exhaust
• 8× 18307597650 – flange nut between the downpipe and the rear section of the exhaust
• 4× 07119907330 – oil feed pipe O-ring
• 2× 11427590577 – oil return pipe O-ring
• 2× 11427577017 – original oil return pipe gasket
• 8× 11427558936 – original coolant pipe O-ring

If the exhaust manifold stud is damaged: 11127593376.

Installation and tuning must be carried out by a qualified specialist. The original wastegate actuators must be refitted before tuning the engine and must be calibrated using ISTA+ software.

Kit weight: 20.41 kg.

Suitable for: BMW 4 I (F32/F33/F36/F82/F83), BMW M2 I (F22/F23/F45/F46/F87), BMW M3 VI (F30/F31/F34/F80).

Approval

This part has no TÜV certification (ABE, TTG or Teilegutachten).

Compatible vehicles (manufacturer data)

Before ordering, check that the product matches your vehicle (model, year and engine). If in doubt, write to us — we will check for you.