Part no: BR8EIX. Why NGK Iridium? More Durability and a Higher Melting Point compared to Platinum, better center electrode anti-oxidation and anti-erosion, improved ignition, superior anti-fouling, lower required voltage, new metal shell plating process for better anti-corrosion. These BR8EIX plugs are recommended for EVO's with mild to moderate bolt-ons. Note: These plugs DO NOT come pre-gapped. Sold in sets of four.