I would probably forget about the intake manifold unless you're looking to wind it out a little more on the top end but you should see some pretty good gains with the tune and exhaust. I ran the same setup on mine before I installed the blower and I would guess it make around 450 at the crank - give or take. It will sound awesome. The 1 7/8" LTHs are the way to go with this car IMO.
2014 Hertz/Penske Mustang GT
2011 VW GTI