2006 Box. S upgrades

[Topless]

The 987 is so good and so well balanced already in acceleration, cornering, transitions, braking, that I am not sure any of those mods would make it more track capable... and it might be slower. I suggest drive the snot out of it for one year. Choose your mods after you get some seat time at the track.

[Sputter]

Spend some time in the seat and good instruction on track driving.
Unless you are experienced in driving on the track in that car, the car is well beyond your abilities in stock form.