As said below, I believe every step down in pulley size equals approx 1 lb of boost increase. I have the same kit being installed right now, and am fully expecting to go down in pulley size as well. Who supplied the tune?
I currently have a JLT intake and tune done by Joe. Great results!!! All drive modes work just fine. I will be removing my JLT and selling it in a couple weeks, when my Whipple arrives...:clap2::clap2::clap2: