Rarely found is a part that is so simple that can make such a difference. Our own lid spacer for LSA Superchargers found on 2nd Gen CTS-V's and ZL1 Camaros. This spacer increases total volume by roughly 63 cubic inches. This will show 5-10hp gains on factory setups and much more with aftermarket pulleys. Retunes are highly recommended to get the most out of this part. 

Carz LSA Supercharger Lid Spacers