ok total noob question here. Whats the FSI and TT model differences and how you know which one you got? <p> I would really love to get this turbo kit, but let me ask this. What difference does the head spacer do for the large amount of HP gain? Also I am sure the motor would have to get built? Does this kit also require cam up grade? Also do you have an intake manifold upgrade and what HP does that bring?