Fitment Information Honda Civic Si 4 Door Sedan 1.5T FE1 (2022, 2023, 2024, 2025) Also fits  EX & Touring Trims, see note below Note For fitment on EX and Touring models, the plastic rear bumper diffuser pieces must be trimmed to allow fitment of the exhaust tips. Or Si trim units (left and right sides) can be installed which already have openings for the tips. Specs & Features Exhaust Type: Single Cat Back System with 3-piece design Piping Diameter: 2.5" neck expanded to 3" mandrel bent piping, transitioning to Y-pipe with 2.5" REMARK Link Loop design Tip Diameter: Dual 4-inch exit slant cut tips (one on each side) Piping Material: Full T304 Stainless Steel for maximum durability and corrosion resistance Muffler Material: Full T304 Stainless Steel for long-lasting performance Muffler Tip Material: Full T304 Stainless Steel for a polished, sleek appearance Welding: Handcrafted high-quality TIG welding for precision and strength Weight: Optimal weight reduction compared to factory mufflers Mid-Pipe: Resonated for improved sound quality and reduced noise Enhance your vehicle's performance and style with our Single Cat Back Exhaust System, featuring a 3-piece design for easy installation. The piping starts with a 2.5" neck expanded to 3" mandrel bent piping, transitioning smoothly to a Y-pipe with a 2.5" REMARK Link Loop design. Dual 4-inch exit slant cut tips, made from full T304 stainless steel, provide a polished and aggressive look. Crafted from full T304 stainless steel, this exhaust system ensures maximum durability and corrosion resistance. The resonated mid-pipe improves sound quality while reducing noise, making it perfect for both daily drivers and performance enthusiasts. Each component is meticulously handcrafted with high-quality TIG welding for precision and strength, and the system is designed to offer optimal weight reduction from the factory mufflers. Upgrade to this high-performance exhaust system and experience enhanced driving satisfaction.