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Feature: Made of high quality material for long lasting durability Direct replacement for a proper fit and easy installation, meets or exceeds OEM standards Responds to spark knock caused by Pre-detonation of the Air/Fuel mixture Allows the engine to run with the ignition timing as far advanced as possible Reference OE Part Number: 30530-PRC-003, KS300, 1904-300252, S8900, SU10549 Fits the following vehicles: 2006-2011 Honda Civic Si Coupe 2-Door 2.0L 1998CC 122Cu. In. l4 GAS DOHC Naturally Aspirated 2007-2011 Honda Civic Si Sedan 4-Door 2.0L 1998CC 122Cu. In. l4 GAS DOHC Naturally Aspirated 2008 Honda Civic MUGEN Si Sedan 4-Door 2.0L 1998CC 122Cu. In. l4 GAS DOHC Naturally Aspirated 2006-2009 Honda S2000 Base Convertible 2-Door 2.2L 2157CC l4 GAS DOHC Naturally Aspirated 2008-2009 Honda S2000 CR Convertible 2-Door 2.2L 2157CC l4 GAS DOHC Naturally Aspirated 2006 CSX Premium Sedan 4-Door 2.0L 1998CC 122Cu. In. l4 GAS DOHC Naturally Aspirated 2006 CSX Touring Sedan 4-Door 2.0L 1998CC 122Cu. In. l4 GAS DOHC Naturally Aspirated