JB4 for BMW GEN1 & GEN2 B58Power gains of up to 120WHP and 120WTQ on a stock vehicle without the risks of flashing! The JB4 is the most advanced and highly featured tuning system available for your B58 powered BMW. Power gains are up to 120hp to the wheels (140hp crank) on a completely stock B58 engine on pump gas, gains with bolt on parts, higher octane, E85 mixtures, and larger turbos are even higher. No ECU flash needed and compatible with locked ECUs The JB4 features a
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