Re: Tuning Guide- Engine, CAI, exhuast questions here
I hope I am understanding the question correctly. I think you are asking if all these mods can be performed and in what order should you do them.
So, No pulleys. the whole front-end accessory drive or FEAD for this motor has been redone in the conversion from east-west installation to north-south, so the engine now uses what Ford calls a stretchy FEAD, with no idlers or tensioners to rob power from the engin. For the air conditioning compressor, a second belt and tensioner to drive all of the other pumps. As long as you dont have the AC on it isnt using/losing any power. They wont ever make underdrive pulleys because of what has been stated above.
Not related to this motor, but if you were boosting, say 4.6 v8, and you did have a set of underdrive pulleys on it prior to a supercharger, you would have to go back to the stock ones anyway.
With all the mods you have listed it really doesnt matter. I would skip the Throttle Body Spacer too.. Not going to do anything. If you went with a Supercharger you could get a bigger Throttle body which will help but only if you boost. Not going to help much at all on a N/A car.
So. Turbocharging. A complete kit isnt really out yet and that said if you are going to go with a turbo setup I would not do Headers or anything forward of the cats until you have the turbo in because you will need to modify or change it out completely and maybe even go back to the stock manifolds or the ecoboost 3.7 manifolds that are on the F150 even. It could be a waste of time and money.
If you are going to go the supercharger/ Procharger route (only one available for our cars right now) then I would do the full exhaust and the supercharger. Might as well do it all at the same time so you can have it dyno tuned all in one shot and save yourself money there. Also, it will be easier to install everything at once as you can take off the stock intake and manifolds and have much more room to work. In this order I would take off the intake manifold and exhaust manifolds. Replace with headers and do the exhaust. Then install the supercharger. This will give you the most room to work while doing the install.