The HJS Tuning ECE Downpipe with integrated high-flow sports catalyst is designed to enhance exhaust performance while maintaining full road legality. Featuring a large 3.15-inch (80 mm) stainless steel construction and a premium-grade catalyst core, this downpipe optimizes exhaust gas flow, reduces back pressure, and supports increased power output. - High-flow sports catalyst for reduced back pressure and enhanced power - Pipe Diameter: 3.15 inches (80 mm) - ECE certified for street-legal use in compliant regions - Direct fitment with OE and Milltek Sport exhaust systems - No ECU tuning required