Jeep Wrangler JL & Cherokee KL 2.0L Turbo JB4 Piggyback ECU Tuner

The JB4 is a true plug-and-play piggyback ECU tuner for the Jeep Wrangler JL and Cherokee KL 2.0L turbo - no coding, no dealer visit, no VIN lock. Just fit, drive, and enjoy up to 40hp at the wheels on 91+ octane.

• Switch maps instantly: stock, sport, track, E85, methanol - all preloaded
• Fully retains Jeep driving modes, traction control and factory safety systems
• Real-time data logging, boost-by-gear, CANbus integration and fault code read/clear
• Rugged billet aluminium housing, USA-built, 5-year warranty
• JB4 PRO Bluetooth module optional for wireless map switching and live monitoring