Welcome! I'm not sure what class the h6 upgrade is legal in, but otherwise, sounds like your car might be legal in ESP (E-Street Prepared) but we highly recommend you run Novice your first year, and not worry too much about classes and modifications while you learn the ropes.

That said, I'd love some direct competition in ESP. Last year I ran uncontested.
I'd consider replacing the stock boost solenoid with a Hallman Pro RX MBC (if your tuner is cool with it) or a 3 port "GM Boost Solenoid".
I love my Koni inserts, but they're more expensive and more of a pain to install than Tokico D-Spec and KYB AGX. I can say that when I moved from KYB AGX to Koni, it helped my times without adding any NVH.