I'm new to these trucks, however not forced induction. To my knowledge it really doesn't matter how much boost you throw at these engines. If your wastegate is set to dump at 5psi than that's all the boost you're going to get. The pulley will only help to increase getting max boost sooner... 2500 Rpms instead of your old pulleys 2800 Rpms as an example. I'm not sure what the specs are with these trucks but if someone knows what psi the WG dumps at that would be very helpful.