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NGK 2309 1 Step Colder Iridium Spark Plug 06-14 WRX / 04-20 STI Denso 2 Step Colder Spark Plugs 04-16 STI Grimmspeed Lightweight Battery Mount Kit 08-21 WRX / 08-21 STI
Ideal for increased boost. High horsepower applications. 2 Year Odyssey Warranty the purchased through Defined Performance.
OEM Subaru Ignition Coil Pack 11-14 WRX / 04-15 STI Off the Line Performance Street Series Ignition Coil Set - Subaru 04-14 WRX / 04-21 STI Subrau Ignition Systems
OEM ignition coil. Plug and Play Compatible with all OEM components
Compatible with OBD-II (On-Board-Diagnostics)
Torque Solution R35 GTR Coil On Plug Ignition (COP) w/ Coils for 02-14 WRX / 04-21 STI
Increased spark output