The P/N 300-608 & 300-608BK Lo-Ram billet burst panel ducts are designed to complement the Holley LS Ultra Lo-Ram EFI intake manifold kits. The Ultra Lo-Ram kits are intended for boosted engine applications where the requirement of an intake manifold plenum burst panel may be recommended to protect the engine from an intake plenum backfire. The 300-608 & 300-608BK Ultra Lo-Ram billet burst panel ducts are made for a standard "large" 6-1/8" x 3-1/8" burst panel. SFI Approved Burst panels, burst panel frame sets, and gaskets may be purchased from various manufacturers such as Allstar Performance or Specialty Fasteners. P/N 300-608 has a clear anodized finish and P/N 300-608BK has a black anodized finish. Mounting fasteners are included in the kit.