I have a Preditor Diablo tuner. It's way out of date, I don't believe they sell it anymore. It came with my car (previous owner bought it). Would a new tuner make a huge difference than the one I have?
4.6 engine,Ford Racing torque bar, diablo performance 93 octane tune, cold air intake with a K&N filter, SLP exhaust from axle back, 3.73 ford racing gears