1. I got my intake ported by JeremyF along with my TB for 300 but now its 400. I had my exhaust manifold coated and ported by gessler for around 600. A tune wasn't required but it did help support the mods
2. I like the springs in the back, they do help with lauching, however lowering of the front would help out alot
3. JeremyF did a moderate port on my TB so I didn't have any problems but others have had problems with too heavy of a port on our cars
4. I haven't had a chance to run her at the track or a dyno but I do run consist high 12's on my dashhawk, I've yet to master the lauch.
Hope this helps you out.