BorgWarner Turbocharger SX K03 Mini Cooper S EP6 HP Upgrade

This BorgWarner turbocharger is identified by exact manufacturer part number 53039880146, but complete vehicle YMM evidence must be verified before ordering. Match the OE number, turbo identification tag, production split, configuration, and every BorgWarner application note.

Key Features

• Billet Compressor Wheel: 54mm inducer milled from forged billet steel supports 20% more airflow for 300-340HP potential at 1.5-1.8 bar boost.
• Dual Ball Bearing CHRA: Ceramic bearings enable faster spool under 3800 RPM for immediate throttle response.
• Direct Bolt-On Design: Matches OEM K03 footprint and flanges for easy installation without manifold or piping changes.
• 54/71mm billet compressor and 45/60mm Gamma-Ti turbine for balanced flow and response.
• Gamma-Ti Turbine Wheel: Lightweight titanium alloy withstands high exhaust temperatures up to 1050C for sustained performance.
• Replace turbo seals and gaskets during swap for leak-free operation.

Fitment

Specifications

What’s Included

One new BorgWarner product in the exact configuration identified by manufacturer part number 53039880146. Gaskets, lines, clamps, housings, actuators, sensors, hardware, and companion components are included only when expressly stated for this part number.

About BorgWarner

BorgWarner develops original-equipment and performance turbocharging systems, including EFR, AirWerks, S-Series, K-Series, SuperCore assemblies, housings, cartridges, actuators, and service components.

Related BorgWarner Products

• BorgWarner Turbocharger SX K03 Mini Cooper S EP6 HP Replacement
• BorgWarner Turbocharger SX K03 Audi/VW 2.0 TFSI Upgrade
• BorgWarner Turbocharger SX K04 Audi RS4 Upgrade (Left)

Browse the BorgWarner collection for related turbochargers, housings, assemblies, actuators, and service components.

Frequently Asked Questions

Why does this BorgWarner part require vehicle fitment verification?
The product is vehicle or engine signaled, but the available exact-part-number evidence does not support a complete year, make, and model record. Confirm the OE number, turbo tag, vehicle application, production split, and every BorgWarner note before ordering.

Is this BorgWarner turbocharger a direct replacement?
Only when the exact part number, dimensions, housings, flanges, rotation, wastegate configuration, oil and coolant connections, and vehicle or system application all match. Similar turbo families are not automatically interchangeable.

What supporting parts should be inspected during installation?
Inspect or replace the oil feed and drain, coolant lines, gaskets, fasteners, intake and charge piping, intercooler, exhaust connections, wastegate hardware, and filtration components. Correct the cause of the previous turbo failure before startup.

Installation Instructions

Follow BorgWarner’s current instructions and the vehicle or system service information for this exact part number. Verify every interface before disassembly, correct the cause of any prior turbo failure, prime the oil system, keep debris out of all passages, use new required seals and fasteners, confirm free rotation and line routing, and check for leaks before load. Professional turbo-system installation and calibration are recommended.