BMW N55 E-Series JB4 Tuning Box E-N55-JB4-A / E-N55-JB4-B

The Burger Motorsports JB4 is a proven, plug-and-play piggyback ECU for BMW N55 engines in E-Series chassis - no remap needed. Delivers up to 60 hp and 60 lb-ft at the wheels on stock cars, with smooth drivability and in-dash map switching.

• Works on E82, E88, E90, E91, E92, E93, E84, E70 and E71 models
• Includes RHD extension harness and model-specific wiring
• Gains scale with mods: up to 100 whp with supporting upgrades
• Fully resellable, VIN-unlocked, same-day UK dispatch
• 5-year BMS repair warranty; billet aluminium construction