2007 Honda Civic Si Sedan Rear Under Spoiler Installation
1. Remove the rear bumper from the chassis and prop it up on a stand so you can cut into it. On the inside of the bumper, there are 10 preset marks to help guide you, just like the front bumper; punch through them and remove any burrs from the edges (refer to instructions for the exact holes). Cut out the rear bumper along the exhaust exit area.
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