Congratulations on your new ride !
However, I am sorry to disappoint you, but there is no such thing as a 'SRT6 Kit'.
The car is either a SRT6 or not.

There are a few things you can do to the N/A ( Normally Aspirated ) models to improve performance :

1. a CAI (Cold Air Induction - either single or dual )
2. exchange the 68mm throttle body for a 74mm one.
3. Get a EuroCharged tune
4. You can retrofit SRT6 brakes ( or even larger ).
5. Wider tires, but the OEM sizes are fine for the N/A.
6. exhaust upgrade ( Magnaflow or Borla cat-back ) - no HP increase, but sounds better.
7. a 'Sprint Booster' - again, no HP added, but more responsive.
and finally .....
8. Fly me out to Tahiti to help you with the updates, shouldn't take more than a week or two ....