Scorpion Exhaust Secondary high flow sports catalyst section to fit BMW F80 M3 / M4 F82 F83 - from year 2014 to 2018. Fits to OEM / Scorpion. Pipe Diameter: 70mm/2.75. Notes: Engine management light may be activated, Stage 2 ECU remap recommended. OE system requires cutting unless fitting SBMS073 or SBMS073C