This product is back ordered with no ETA expected this year, but take a look at the new WEAPON❌ BILLET LID!
https://weaponxmotorsports.com/products/wxm-billet-lt4-lid
This Billet LT4 Supercharger Lid replaces the factory supercharger lid on GM LT4 Superchargers for a quick and clean install. The improved airflow design of the lid increases up to 25HP by itself and has machined ports so you can add nitrous and / or water methanol injection systems later if desired.