One of the most popular spark plugs for use in a well modded DSM running higher boost. One range colder than stock.

Also the OEM plug used in the EVO 8

Traditional Spark Plug, 14mm Thread Size, 19mm (3/4″) Reach, 13/16″ (20.6mm) Hex Size, Gasket Seat, Resistor, Removable Terminal Nut, JIS Height, Projected Tip, .031″ (0.8mm) Gap, Heat Range 7

Stock #5534