This is an emission legal exhaust system. The exhaust system is installed after original/OEM catalytic converters and does not impact any components of the factory emission system. The system is made specifically for vehicle models shown above. You're going to love the deep, rich and throaty sound from our performance exhaust system. It has been expertly engineered to provide an aggressive muscular exterior sound while minimizing interior resonance. The result is a perfectly tuned exhaust note. If you do not see your vehicle listed, please contact us for assistance. Retain All OEM Catalytic Converters. Does NOT Modify Any Vehicle Emission Component. Fully Emission Legal Exhaust System Fit: 2016-2019 Ford Focus RS 2.3L Ecoboost. Will Only Fit RS Hatchback 4-Door. Excludes All Others Models Tube Diameter: 3" Inlet Pipe Into 3" Tailpipes. Moderate Exterior & Interior Sound Level. Dual Walled Polished Stainless Tips Included Hardware(s) Included Exactly As Shown. Improve Sound, HP/TQ & Throttle Response. TIG Weld & Mandrel-Bent For Maximum Performance Top Quality SS409 Stainless Steel. Affordable Pricing. Instruction Not Included. Professional Installation Strongly Recommended