Milltek Sport BMW 2 Series M2 Competition Coupé (F87)2018 Large Bore Downpipes and Hi-Flow Sports Cats Removes OE Primary Cats and OPF/GPF's and Replaces with 2 x 200CPSI High Flow Cats - Requires Stage 2 ECU Software - Must be fitted with Milltek Sport Catback Only Tip Style: Pipe Diamater Inches:2.76