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NGK 2309 1 Step Colder Iridium Spark Plug 06-14 WRX / 04-20 STI Grimmspeed Lightweight Battery Mount Kit 08-21 WRX / 08-21 STI Off the Line Performance Street Series Ignition Coil Set - Subaru 04-14 WRX / 04-21 STI
Ideal for increased boost. 2 Year Odyssey Warranty the purchased through Defined Performance. Plug and Play
Torque Solution R35 GTR Coil On Plug Ignition (COP) w/ Coils for 02-14 WRX / 04-21 STI
Increased spark output