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NGK Stock Heat Range Iridium Spark Plugs 02-05 WRX NGK 1 Step Colder Iridium Spark Plugs 02-05 WRX NGK 2309 1 Step Colder Iridium Spark Plug 06-14 WRX / 04-20 STI
Set of 4 plugs Set of 4 plugs Ideal for increased boost.
Off the Line Performance Street Series Ignition Coil Set - Subaru 04-14 WRX / 04-21 STI Subrau Ignition Systems Torque Solution R35 GTR Coil On Plug Ignition (COP) w/ Coils for 02-14 WRX / 04-21 STI
Plug and Play Compatible with all OEM components
Compatible with OBD-II (On-Board-Diagnostics)
Increased spark output