*This listing is for a RaggDoll series turbo build using a brand new and complete Borg Warner turbocharger as a core.

New Genuine OEM BorgWarner Rennen HF (HIGH FLOW) Turbocharger

“The most advanced K04 hybrid upgrade ever for the Porsche 718 2.0L”

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Maximum Flow. Relentless Power. Race-Level Engineering.

The RaggDoll Rennen HF turbocharger is the next evolution of performance for the Porsche 718 2.0L platform — a weaponized version of our already class-leading Rennen turbo. Building on the proven architecture that outperforms every other K04 hybrid available for the 2.0L Porsche 718, the Rennen HF takes things even further with extensive race-style housing porting for the ultimate in airflow and response.

Paired with our upgraded fuel system and RaggDoll supporting mods, the Rennen HF delivers 500+ crank horsepower on pump gas — with faster spool, even bigger midrange torque, and stronger top-end power than any other bolt-on solution for the Porsche Cayman Boxster and T 982 2.0L platform. 

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RaggDoll Rennen HF Features

• True Plug-and-Play: Direct bolt-on, no modifications required.
• Exclusive Race-Ported Housings: Extensive compressor and turbine port work to maximize flow.
• Advanced Compressor Design: Maximum efficiency and broader torque powerband.
• High-Flow Turbine Wheel: Fast spool with unbeatable top-end breathing.
• Genuine BorgWarner Cartridge: Built from OEM-quality internals and housings.
• Inconel Turbine Wheel: Handles extreme 1050°C (1922°F) exhaust temperatures reliably.
• Cooler IATs Under Boost: Increased airflow at lower boost pressure means lower intake temps and more stable performance.
• Track-Tested, Dyno-Proven: Real-world performance you can count on.
• Features internal aerodynamic revisions developed in-house to increase mass flow and response without compromising reliability.

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What Porting Does for a Turbocharger

Housing Porting:

Careful, race-style porting of the compressor and turbine housings improves turbocharger performance by:

• Reducing airflow restrictions through the housing passages.
• Smoothing abrupt transitions and sharp edges that cause turbulence and backpressure.
• Allowing higher volume and velocity of air to move through the turbo, helping the turbo spool faster and produce more power with less effort.
• Minimizing unwanted pressure drops across the housings for a more efficient pressure ratio.

In the Rennen HF, the turbine inlet, volute passages, and compressor cover transitions have all been aggressively optimized for maximum gas and air flow while preserving velocity.

Designed for Maximum Real-World Performance

The Rennen HF was born from extensive track and dyno testing across dozens of 718 builds, ensuring:

• Faster Spool: Builds boost earlier and harder.
• Wider Powerband: Midrange torque hits harder, and top-end power carries further.
• Higher Efficiency: Less heat, lower backpressure, and more consistent output, lap after lap.‍
• OEM Reliability: Maintains factory-like driveability and reliability with dramatically upgraded performance.

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Our Proprietary Compressor and Turbine Pairing

• Advanced, High-Flow Compressor Wheel: Designed to maximize efficiency and mass airflow without the surge or lag of older designs.‍
• High-Flow Turbine Wheel: Perfectly matched to the compressor to deliver superior turbine-to-compressor flow balance.
• Incorporates stealth-mode modifications that improve gas inertia and volumetric flow without compromising blade integrity.

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We strongly recommend pairing the Rennen HF with the RaggDoll High-Flow Turbo Inlet to allow the turbo to breathe to its full potential.