New CDI Immobilizer Bypass to replace the ACI 100 CDI unit on Peugeot scooters with 2-stroke 50cc engine. Will also work on 100cc models. Immobilizer Bypass on Vivacity scooters. No rev limiter. Fits: Peugeot Vivacity 50cc Air-Cooled up to 2008 Peugeot Vivacity 50cc Liquid-Cooled up to 2008 Peugeot Vivacity 100cc up to 2008 Peugeot Speedfight 2 50cc Air-Cooled Peugeot Speedfight 2 50cc Liquid-Cooled Peugeot Speedfight 2 100cc Peugeot Trekker 50cc/100cc Peugeot Elyseo 50cc/100cc cm Peugeot Looxor 50 cc cm/100 cu. cm Peugeot Elystar 50 cc cm Peugeot Squab 50 cc cm Peugeot Metal X 50 cc cm