This Milltek system is designed to replace the factory particulate filter, providing a freer exhaust gas flow and improved engine response. It unleashes the vehicle’s true sound, adding a deep and aggressive exhaust tone. All components are made from aerospace-grade 304L stainless steel, ensuring resistance to corrosion and long-lasting durability even under harsh conditions. A perfect choice for those seeking enhanced performance and sound from their vehicle. Specifications - Pipe diameter (inches): 3.15 - Feature 1: Fits to OE Downpipes and Milltek Sport Particulate Filter Back System Only - Feature 2: Only compatible with models with flanged front connection - Feature 3: Requires Stage 2 ECU Remap or OPF/GPF Bypass Module