CTS Turbo Stage 2+ Turbo Upgrade Kit – BMW N54 335i / 335xi / 335is (E90/E92/E93) | 600–700HP | GTX Gen2 Billet Compressor Wheels | LHD Only

The CTS Turbo Stage 2+ Turbo Upgrade Kit for the BMW N54 335i, 335xi, and 335is (E90/E92/E93) is CTS Turbo's larger Stage 2 turbocharger kit for the N54 — a complete twin-turbo upgrade featuring GTX Gen2 11-blade billet compressor wheels, 9-blade turbine wheels, and a flow-optimized stainless steel exhaust manifold and housing, rated for 600–700HP. These are brand-new complete turbocharger units — no core exchange required, no wait time for core return. If you want to extract the maximum power from the N54's twin-turbo architecture before committing to a single-turbo conversion, the CTS Turbo Stage 2+ kit is the definitive twin-turbo upgrade for the N54 platform. LHD (left-hand drive) applications only — this kit will NOT fit right-hand drive vehicles. A professional tune is required after installation.

Key Features:

• GTX Gen2 11-blade billet compressor wheel — CTS Turbo's Stage 2+ turbos use GTX Gen2 11-blade billet machined compressor wheels — superior flow, superior strength, and superior high-RPM performance compared to cast compressor wheels
• 9-blade turbine wheel — 9-blade turbine wheel for improved exhaust gas flow and turbine efficiency
• Flow-optimized stainless steel exhaust manifold and housing — CTS Turbo's flow-optimized stainless steel exhaust manifold and turbo housing — improved exhaust gas flow for faster spool and more consistent boost delivery
• 600–700HP rated — the Stage 2+ turbos are rated for 600–700HP — the maximum power available from the N54's twin-turbo architecture before a single-turbo conversion is required
• Noticeable mid-to-high RPM performance — the larger Stage 2+ wheels deliver a significant improvement in mid-to-high RPM power and torque compared to the factory turbos and Stage 1 upgrades
• Bolt-on fitment — compatible with any aftermarket downpipes and charge pipes — no custom fabrication required for the turbo installation itself
• Brand-new complete units — no core exchange required — complete new turbocharger units shipped directly — no wait time for core return or rebuild
• Installation kit included — all required hardware for installation included in the kit
• 2" compressor covers — require aftermarket inlet pipes — the factory N54 inlet pipes are not compatible with the Stage 2+ turbos' 2" compressor covers

Stage 2+ vs. Stage 1 — Understanding the Difference:

• Stage 1 (factory-frame turbos): Upgraded turbos using the factory turbo frame with upgraded compressor and turbine wheels — correct for moderate power targets where the factory frame's flow capacity is sufficient. Faster spool, more OEM-like power delivery, lower power ceiling.
• Stage 2+ (this kit — CTS-TR-0300RS): Larger turbocharger units with GTX Gen2 billet compressor wheels and a new stainless steel exhaust manifold and housing — correct for the highest power targets available from the N54's twin-turbo architecture. More noticeable mid-to-high RPM power delivery, 600–700HP capability, and the maximum twin-turbo performance available before a single-turbo conversion. The correct choice for N54 owners who want the most power possible from a twin-turbo setup.
• Single Turbo: Beyond the Stage 2+ power ceiling, a single-turbo conversion is required for further power increases. The Stage 2+ kit is the definitive twin-turbo upgrade before that step.

Aftermarket Inlet Pipes — Required:

The CTS Turbo Stage 2+ turbos use 2" compressor covers that are not compatible with the factory N54 inlet pipes. Aftermarket inlet pipes are required for correct installation — the factory inlet pipes must be replaced with aftermarket units that match the Stage 2+ turbos' 2" compressor cover inlet diameter. Verify that you have or are sourcing compatible aftermarket inlet pipes before ordering the Stage 2+ kit. CTS Turbo and other N54 performance suppliers offer compatible inlet pipes — confirm compatibility before purchasing.

LHD Fitment — Critical Note:

This kit is for left-hand drive (LHD) vehicles only — it will NOT fit right-hand drive (RHD) vehicles. The N54 335i/335xi/335is was sold in both LHD and RHD configurations in different markets. Verify your specific vehicle's steering configuration before ordering. This kit will also fit the BMW 135i, 535i, and Z4 35i with N54 engine if the charge pipe and rear turbo return coolant line are converted to the LHD 335i specification — this conversion is the responsibility of the installer and is not included in the kit.

Tuning — Required:

A professional tune is required after Stage 2+ turbo installation. The Stage 2+ turbos operate at significantly different boost levels, spool characteristics, and airflow volumes than the factory turbos — the factory ECU calibration is not appropriate for Stage 2+ hardware and will result in incorrect fuelling, incorrect boost control, and potential engine damage. A professional tune by an N54-experienced tuner on a capable ECU tuning platform (MHD, BM3, or equivalent) is required before the engine is run under boost with the Stage 2+ turbos installed. Budget for a professional tune as part of the Stage 2+ upgrade cost.

Specifications:

• Brand: CTS Turbo
• Part Number: CTS-TR-0300RS
• Stage: Stage 2+
• Compressor Wheel: GTX Gen2 11-blade billet
• Turbine Wheel: 9-blade
• Manifold: Flow-optimized stainless steel
• HP Rating: 600–700HP
• Compressor Cover: 2" (requires aftermarket inlet pipes)
• Core Required: No — complete new units
• Drivetrain: LHD only
• Application: BMW N54 — E90/E92/E93 335i / 335xi / 335is

Fitment Information:

• BMW E90 335i / 335xi — N54 engine — LHD only
• BMW E92 335i / 335xi / 335is — N54 engine — LHD only
• BMW E93 335i / 335xi — N54 engine — LHD only
• BMW 135i, 535i, Z4 35i — N54 engine — with charge pipe and rear turbo return coolant line converted to LHD 335i specification (conversion not included)
• LHD (left-hand drive) only — will NOT fit RHD vehicles
• Note: Aftermarket inlet pipes required — factory N54 inlet pipes not compatible with Stage 2+ 2" compressor covers. Professional tune required after installation. Verify your specific N54 vehicle's steering configuration (LHD/RHD) before ordering.

What's Included:

• CTS Turbo Stage 2+ turbocharger units (pair) — complete new units, no core required
• Flow-optimized stainless steel exhaust manifold and housing
• Installation kit — all required hardware for installation
• Aftermarket inlet pipes not included — required for installation

Installation Notes:

• Professional installation by an experienced N54 specialist strongly recommended — twin-turbo replacement on the N54 is a complex procedure requiring correct torque specifications, correct coolant and oil line connections, and thorough leak testing before the engine is started
• Source compatible aftermarket inlet pipes before installation — the Stage 2+ turbos' 2" compressor covers are not compatible with the factory N54 inlet pipes
• A professional tune is required before running the engine under boost with the Stage 2+ turbos — do not attempt to drive the vehicle under boost on the factory ECU calibration
• Prime the turbocharger oil supply before the first start — ensure the turbos receive oil pressure before the first cold start to prevent bearing damage
• Check all oil and coolant connections for leaks after installation and after the first heat cycle
• Allow the turbos to reach operating temperature before applying full boost — follow a proper break-in procedure for the first few heat cycles

Why CTS Turbo?

CTS Turbo is one of the most respected BMW performance brands in the North American aftermarket — known for their turbo upgrades, charge pipes, intakes, and performance components for the N54, N55, S55, and B58 BMW platforms. CTS Turbo's Stage 2+ N54 turbo kit is the result of extensive N54 development — a kit that has been proven on the N54 platform by serious builders who want the maximum twin-turbo performance available before a single-turbo conversion. For N54 335i/335xi/335is owners who want the definitive twin-turbo upgrade from a brand with proven N54 performance credentials, CTS Turbo Stage 2+ is the correct choice.

Perfect For:

• BMW N54 335i, 335xi, and 335is (E90/E92/E93) LHD owners who want the maximum power available from the N54's twin-turbo architecture — 600–700HP with GTX Gen2 billet compressor wheels and a flow-optimized stainless manifold
• N54 builds that have exhausted the power ceiling of Stage 1 turbo upgrades and want the next level of twin-turbo performance before committing to a single-turbo conversion
• Owners who want complete new turbocharger units with no core exchange requirement — immediate availability without the wait time of a core-exchange rebuild program
• Serious N54 performance builds where the CTS Turbo Stage 2+ kit is the foundation of a 600–700HP twin-turbo build

Critical Notes: LHD only — will NOT fit RHD vehicles. Aftermarket inlet pipes required — not included. Professional tune required before running under boost. Professional installation strongly recommended. Prime oil supply before first start. 135i/535i/Z4 fitment requires charge pipe and coolant line conversion to LHD 335i spec.