Fitment Information Honda Civic Si Sedan (2017, 2018, 2019, 2020, 2021) Specs & Features Strong 304 Stainless Steel Piping and Flanges Polished Stainless Steel Dual Race Mufflers with 100mm (4-inch) tips 76mm (3-inch) tubing end-to-end 76mm (3-inch) Universal Flange Fits Stock Downpipe High Flow Resonator Skunk2 MegaPower Badge Includes All Necessary Hardware Works with Skunk2 MegaPower Exhaust Silencer Superior Fit, Finish, Quality and Sound Tested and Proven for Maximum Results Product Description 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, dual race mufflers mounted center beneath the bumper, this system emits that iconic, vicious Skunk2 exhaust note. New bolt-on exhaust hanger hardware is included for use with the OEM hangers to allow adjustment for exact positioning of the exhaust.  Additionally, new exhaust flange gaskets, bolts, and nuts are also included to ensure the system is free of leaks. Skunk2 MegaPower Exhausts Feature: T304 Stainless Steel Construction Robotically TIG Welded for strength CNC Machined mandrel bends for smooth flow and a precise fit Skunk2 removeable silencer and all necessary hardware is included