This Injen exhaust is perfect for car enthusiasts who want to boost their vehicle's performance. Whether you're cruising on the highway or hitting the track, it'll make your driving experience more exciting. It's designed for Honda Civic Si models from 2006 - 2011 and the 2008 Civic MUGEN Si. The exhaust has a 60mm axle - back design, and it's made of mandrel bent stainless steel tubing, which ensures smooth airflow.