250 LS1 CATHEDRAL PORT KIT. EFI DIRECT PORT IN MANIFOLD- 16 RIB FOR ATI CORVETTE BALANCER (#3152) This TBS Low-Profile 250 Supercharger kit is specifically for LS1 Cathedral Port applications. Designed for mild street use and comes as a complete kit for one convenient price. The Billet Aluminum LS1 manifold is directly ported for Electronic Fuel Injection. This drive kit features a 16 Rib serpentine style belt drive. It includes the 250 supercharger, LS1 manifold, and all necessary drive accessories required for assembly. For use in conjunction with ATI Corvette Balancer. ATI PN#917246 The 250 is a max 10lb boost application.