Edelbrock Performer RPM EFI Upper & Lower Intake Manifold Kit for 1986-1995 351W Mustangs.Designed for 1986-95 Ford Mustangs with 351W swap, these Performer 5.8L EFI aluminum intake manifolds from Edelbrock represent the standard for hot late model performance. Their modular design incorporates the latest airflow technology and CAD programming for maximum power gains--up to 37 HP at 5,500 rpm--with no loss of low-speed torque. They feature a broad power range from idle to 5,500 rpm, a removable plenm cover that allows access to runners for modification, and their base manifold is CNC port-matched to the upper manifold for maximum performance. The upper and plenum cover are powdercoated light titanium gray. The base is as-cast and is not powdercoate.