The 06-11 Honda Civic Si is one of Honda's finest achievements when it comes to performance sport compacts. This K20Z3 engine packs quite a punch with 197bhp and 139ft/lbs. In usual Honda performance fashion this car sports the VTEC technology that Honda fans have come to know and love. JSC Speed carries a ton of Civic Si performance parts that are from big name brands like Invidia, Cobb, Greddy & GTSPEC. If you want to boost the performance of your Civic Si, this is the best place to start.