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Group 4: JB4 VW Performance Tuner bmw-3-series--e36--1990-1999-esi3796427 it is recommended to avoidJB4 Group 4: VW Performance Tuner The JB4 is a true user adjustable plug and play solution for Gen3 Jetta GLI and Turbo Beetle. Power Gains starting at 55bhp and 60ft lb with 91 octane 95Ron with + 4. 0 psi boost over stock on the default setting. Up to 80bhp and 80ft lb with bolt on modifications, higher octane, and boost adjustment with the optional wireless JB4PRO Bluetooth connection. The JB4 features CANbus connectivity for more advanced tuning,