This Nitrous Express billet supercharger lid is made for LT4 applications and incorporates integrated nitrous ports; the listing is for the lid only. Machined from billet, it provides a direct replacement top for LT4 superchargers where integrated nitrous feed points are required, allowing installation of nitrous plumbing without changing the supercharger housing.

Nitrous Express Billet Supercharger Lid - LT4 Applications w/Integrated Nitrous Ports (Lid Only)