someone asked me to elaborate on this, explain what it is.
In a nutshell ITBs are the best air intake possible on an engine. They are a dedicated and separated air intake for each cylinder. They allow to maximize the air flow and give the best power.
Airbox can achieve very similar performance is perfectly designed.
ITB are quite uncommon on the LS7 and are usually seen in show cars or drag cars. Cars with ITB have THE BEST SOUND EVER, as it will maximize the intake sound. Basically all race engine have ITB and some very notable street engines too, like the E46 M3 CSL.
here's an example video on YT:
a good explanation from a great YT channel :
I've not installed these, you will definitely need to do a tune after installing them as the airflow will be completely different (better).
Please note that these are side-draft so there should be no problem with hood fitment.