Skunk2 Racing 412-05-1930 Alpha Series Header for 2006-2011 Honda Civic Si
Brand: Skunk2 Racing
Complement with a genuine Skunk2 MegaPower Exhaust system for maximum exhaust flow
Race applications only - eliminates catalytic converter
O2 sensor bung thread pitch: M18 x 1.5
Not compatible with K24 bottom-end swap
Includes adapter flange, donut gasket, and exhaust hanger mounting bracket