KS300 Ignition Knock Detonation Sensor for 2006-2011 Honda Civic Si 2006-2009 Honda S2000 & 2006 Acura CSX # 30530-PRC-003 5S9087 [Function]: TOP quality Detonation Knock Sensor, 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 [Quality Assured]: Direct replacement for a proper fit and easy installation, quality materials used, meet or exceed OEM standard, 100% tested before shipped [Compatible]: Fit for 2006 2007 2008 2009 2010 2011 Honda Civic Si, 2006 2007 2008 2009 Honda S2000, 2006 Acura CSX [Reference Part Number]: 30530-PRC-003, KS300, 1904-300252, S8900, SU10549 [Warranty]: Order from MNJWS, we offer a 12 month warranty, true worry-free shopping experience