Downpipe Brondex BMW M3/M4/M2 F87N Competition • Improved Exhaust Sound; • Improved Power; • Diameter 3 inch, wall thickness 2mm; • For 105mm flange. • Complete high-quality stainless steel (AISI 304); • Double-sided welding of flanges and most loaded joints; • Oxygen sensor ports by standard scheme; • 100% OEM fit, easy to replace factory part; • All the necessary fasteners are in set;