Milltek Sport non-resonated 102mm X-Pipe secondary catalyst bypass mid-pipe for the BMW G87 M2 (S58). Hand-finished T304L stainless steel construction with mandrel bends for maximum flow. Non-resonated design delivers a full-throttle character without mid-range drone, using factory hangers and mounting points for a true OEM+ fitment with no modification required. Key Features: T304L stainless steel, mandrel-bent construction. 4 inch primary / 102mm secondary pipe diameter. Replaces factory secondary catalytic converter section. Fits OE axle-back or Milltek axle-back exhaust. Fits: BMW M2 2023+ (G87, S58 engine)