This flange is designed to allow you to run a 2.5 inch diameter header with your factory or aftermarket exhaust. This product is most commonly used with older Honda/Acura applications, such as the 1990 to 2001 Acura Integra or 1988 to 2000 Honda Civic
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Don't have a 2013 Honda CRZ?
The link bellow will drop you to the same Downpipe but for a different car