JB4 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