Came across this thread the other day.
https://www.camaro6.com/forums/showthread.php?t=540899
The second photo showing part of the bottom of the OEM intake box removed caught my attention. Callaway calls this their high flow Cold Air intake on their SC630 and SC750 Camaro ZL1 packages.
This high flow intake turns out to be nothing more than the OEM intake box with a Green drop-in filter and part of the bottom removed.
Feeling a little bored and already having a Green filter on my car, I decided to recreate this Callaway high flow cold air intake.
I wanted the ability to go back to the unmodified stock box, so instead of cutting up my existing box, I ordered a used SS intake off of eBay. And yes, the SS and ZL1 use the same plastic intake box and filter.
Can't say my butt dyno feels a difference from this mod. But there's no question the supercharger whine is much more pronounced.
For the cost a Green filter and an hour or so with a dremel, you'll get blower whine on par with cold air intakes on the market costing hundreds of dollars more. You may also pick up a few extra ponies as well.