CP-Carrillo Automotive Piston, Set Of 8, Cyl: 8, Material ID: 2799 066E3 Light Do I need to use

Do I need to use a gasket with this header

1) Subaru Impreza WRX 02-07 / STi 2004 - Street Series Coilovers - MR-CDK-SI02

no welding or custom fabrication needed

clear light output ensures optimal nighttime and adverse weather performance

Factory mounting points - Installs at original radiator support locations with no drilling or fabrication

CP-Carrillo Automotive Piston, Set Of 8, Cyl: 8, Material ID: 2799 066E3 Light Do I need to useSmall Block Chevy LS1 Piston Kit SBC LS1 Flat Top & Dish Designed on X style forging to clear reluctor wheel Fit LS1, LS2 and LS6 heads Designed for shorter wrist pins Pinfitting included at no cost Chamfered pins and wire locks included Accumulator and anti detonation grooves included Designed for back cut rings Double pin oilers, force fed from oil ring Pick lock grooves for easy lock removal Custom skirt cam and barrel shapes Supplied with Wire