“The most advanced K04 hybrid upgrade ever for the Porsche 718 2.0L — full porting, extrude-honed housings, 500+ HP capable.”
Maximum Flow. Relentless Power. Race-Level Engineering.
*This listing is for a RaggDoll series turbo build using a brand new and complete Borg Warner turbocharger as a core.
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 and full extrude honing 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.
RaggDoll Rennen HF Features
What Porting and Extrude Honing Does for a Turbocharger
Housing Porting:
Careful, race-style porting of the compressor and turbine housings improves turbocharger performance by:
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.
Extrude Honing:
Extrude honing takes the porting process even further by using a high-pressure abrasive media that is forced through the turbo’s internal passages. This process:
Combined, porting and extrude honing allow the Rennen HF to move significantly more air and exhaust energy than any other small-frame K04-based hybrid — without needing oversized, lag-inducing housings.
Designed for Maximum Real-World Performance
The Rennen HF was born from extensive track and dyno testing across dozens of 718 builds, ensuring:
Our Proprietary Compressor and Turbine Pairing
We strongly recommend pairing the Rennen HF with the RaggDoll High-Flow Turbo Inlet to allow the turbo to breathe to its full potential.