The best plugs for imports running any type of forced induction have always been NGK Copper Spark Plugs.
NGK non protruding tipped plug. One range colder than stock and the non protruding tip is great for high boost applications.
These plugs are one step "colder" than stock for the EVO 8, and two steps "colder" for the DSM and take well to increased boost or the addition of race fuel much better than the stock recommendation of the BPR7ES. These plugs are recommended for EVOs with mild to moderate bolt-ons, and DSMs with more advanced power adders.
Traditional Spark Plug, 14mm Thread Size, 19mm (3/4") Reach, 13/16" (20.6mm) Hex Size, Gasket Seat, Resistor, Removable Terminal Nut, .031" (0.8mm) Gap, Heat Range 8