Well I think if I was you i'd do a coilover setup so you can be low and handle better. New sways.
Then copy Dave and do CTS-V brakes.
Headlight retro
Inferno Hood
The front lip that I for the life of me can't remember.
LED tails and have flip tint them
Window tint if you don't already have it

Assuming youre stock
Headers
Intake
Full stack cooler
Colder plugs
Tune
3.4 maybe? Not sure on a Gen V.

Probably over 8K though lol