Skunk2 Racing Double Barrel Exhaust | 2017-2020 Honda Civic Si Sedan (413-05-6060)2017 2020 Honda Civic Si Sedan Double Barrel Exhaust by Skunk2 Racing Decades of race engineering are incorporated into every part Skunk2 develops. Our MegaPower Double Barrel (DB) Exhaust system for the 17 '20 Honda Civic Si Sedan is no exception. All MegaPower exhaust systems are finely tuned using CNC Mandrel bends, precision robotic TIG welds, and unrestrictive resonators to maximize exhaust velocity and eliminate restriction. Featuring parallel,