Description
JB4 Performance Tuner for 2017+ Porsche 718 Cayman & Boxster
Unlock exceptional performance from your turbocharged Porsche 718 with the JB4 Performance Tuner, the most advanced plug-and-play tuning system available for modern Porsche platforms. Designed specifically for the 718 Cayman and Boxster models, the JB4 delivers substantial horsepower and torque gains while retaining factory-like drivability, safety, and reliability.
With fully customizable maps, real-time engine parameter monitoring, E85 compatibility, and seamless CANbus integration, the JB4 provides fine-tuned control and unmatched performance enhancement—perfect for both stock and modified vehicles.
Key Features & Performance Benefits
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Increase power by up to 75whp and 75wtq on a stock vehicle
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Noticeably quicker 0–60 mph and quarter-mile times
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Includes 8 preloaded maps tailored for various fuel types and modification levels
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E85 ethanol-compatible maps for maximum power potential
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Ability to read and clear fault codes directly through the tuner
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Monitor and log 40+ real-time engine parameters via the JB4PRO mobile app
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Boost-by-gear control for improved traction off the line
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Fully compatible with the FREE JB4PRO app for wireless tuning, logging, and adjustments
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Offers superior performance and safety compared to generic plug-in chips
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True plug-and-play installation with no permanent ECU changes
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Advanced CANbus OBDII integration for precise control and industry-leading features
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Smooth like factory—OEM-level drivability with unchanged fuel economy during normal driving
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Works flawlessly with all Porsche driving modes
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Requires 91+ octane fuel for performance gains
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Not VIN-locked—remove anytime and resell without leaving a trace
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Includes a durable billet aluminum JB4 enclosure
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Designed and assembled in the USA
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Covered by a 5-year warranty
Vehicle Fitment
Porsche 718 Models — 2017+
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718 Cayman
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718 Cayman S
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718 Cayman GTS
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718 Boxster
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718 Boxster S
What Is the JB4?
The JB4 is a sophisticated plug-and-play tuning system engineered for turbocharged engines. Installed between the vehicle’s sensors and the factory ECU/DME, it safely adjusts boost pressure, ignition timing, and fueling to deliver significant performance gains. Unlike basic modules, the JB4 uses high-speed CANbus data, integrated fuel and spark control, and smartphone connectivity to provide advanced tuning capabilities not found in other systems.
With regularly released free firmware updates and new mapping, the JB4 continuously evolves—ensuring your Porsche always benefits from the latest advancements. Its reversible design allows quick removal without detection, and its global presence in over 67 countries underscores its reputation as the industry benchmark in turbocharged performance tuning.
Is the JB4 a Real Tune?
Absolutely. The JB4 offers tuning control comparable to a full ECU reflash—adjusting boost, timing, AFR, and fuel trims in real time using CANbus data. It enhances power safely and smoothly while maintaining all factory ECU safeguards. Unlike a reflash, the JB4 does not require ECU unlocking or leave a digital footprint, making it the ideal performance upgrade for Porsche 718 owners seeking maximum gains with zero risk.
