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Yes, you'll need to upgrade to OBD1.
As far as injectors, that would be a conversation that you would want to have with your tuner, as he'll be the one to determine if your current fuel supply is suffice with just increasing the pressure, or if they feel upgraded injectors are necessary.
As far as injectors, that would be a conversation that you would want to have with your tuner, as he'll be the one to determine if your current fuel supply is suffice with just increasing the pressure, or if they feel upgraded injectors are necessary.