If your planning on going with the blower kit, do not buy an ECU or any other electronic devices...they come with the kit. The Kamikaze header is also part of the kit, and it's almost 20 hp above any of the competition. As for NOS....Never touch the stuff.
For your inlet tube use a constant 3" ID tube, and build a radiused connection for the throttle body as I described the other evening. Use the formula R/D=.5 , where D is the diameter of the max.ID of the throttle body, should give you a theoretical entry radius of about 1.3". So if you make a drawing of the side view of the throttle body, the ID is 2.90", now set a compass to 1.3" and place the point 1.3" away from the TB and swing an arc. Repeat for the other side, and you'll see the correct shape or radius to build.
.............................T.O.O. ..............................................