4 x NGK Platinum Spark Plugs for your Mitsubishi Lancer Evolution I CD9A One of the best spark plugs money can buy. Manufacturers Part Number PGR6A NGK Stock Number 4984 Plug Diameter 14mm Thread Length 19mm Hex Nut 20.8mm Heat Range 6 Laser Platinum® spark plugs provide high ignitability and longer service life. Dual platinum surfaces ensure slow wear rate providing stable idle, superior anti fouling, improved fuel efficiency and lower emissions. See HERE for PDF regarding NGK Plugs.
