Adding a supercharger or supplemental turbo will make massive functionality gains, Though more intricate to configure. We've got this text covering twinchargers if you'd like to read a lot more. Altering valve durations can alter the torque band and on most engines the exhaust and intake durations never should match, https://ricardomzksw.worldblogged.com/37318891/mitsubishi-4b12-engine-for-sale-no-further-a-mystery