98-2002 Camaro/Firebird LS1 BBK Intake Manifold, shipping is not included. Designed for the popular LS1 Based Camaro/Firebird/Corvette & GTO , this new SSI Series Performance intake manifold delivers unmatched performance and value when compared to others. Adds 12-25 horsepower over the factory manifold Standard 85mm throttle body opening Flows approximately 15% better than Z06 manifold Made from lightweight 356 aluminum Factory style o-ring gasket design Standard titanium powder coat finish