This is a "FULLY PORTED STOCK INTAKE MANIFOLD" for a 1986 or 1987 Buick Grand National, T Type, Turbo T, or GNX 3.8 liter turbo V6. This intake is ported to a Fel-Pro 1200 gasket. The intake is poly coated through out the runners to assure smooth air flow.                                       *Note- Sold on exchange only.